fix: 1.1.1.3 online installer 5.8M + mods toggle + ZGC vs G1GC conflict

- server/main.py BUILDS_DIR absolute + /launcher/download/online,offine-setup
- site index/js online->/download/online 5.8M
- LaunchCommandBuilder skip G1GC when systemBasedJvm (ZGC conflict -> Bootstrap crash)
- JFXLauncher toggle robust rename + FileAlreadyExists fix

launcher/launcher/src/main/java/sashegdev/zernmc/launcher/minecraft/launch/LaunchCommandBuilder.java

@@ -120,16 +120,19 @@ public class LaunchCommandBuilder {
                 command.add("-Djava.library.path=" + nativesDir.toAbsolutePath());
             }
 
-            // Append memory/GC args (always after version.json args, like AstralRinth)
+            // Append memory/GC args (always after version.json args, like AstralRinth) — skip if systemBasedJvm adds its own GC (ZGC/G1)
+            boolean useSystemGc = me.sashegdev.zernmc.launcher.utils.Config.isSystemBasedJvm();
             int ramMB = options.getMaxMemory() > 0 ? options.getMaxMemory() : 4096;
             command.add("-Xmx" + ramMB + "M");
             command.add("-Xms" + Math.max(512, ramMB / 2) + "M");
+            if (!useSystemGc) {
                 command.add("-XX:+UseG1GC");
                 command.add("-XX:+UnlockExperimentalVMOptions");
                 command.add("-XX:G1NewSizePercent=20");
                 command.add("-XX:G1ReservePercent=20");
                 command.add("-XX:MaxGCPauseMillis=50");
                 command.add("-XX:G1HeapRegionSize=32M");
+            }
 
             // Append custom user JVM args
             if (options.getExtraJvmArgs() != null && !options.getExtraJvmArgs().isEmpty()) {

launcher/launcher/src/main/java/sashegdev/zernmc/launcher/ui/jfx/JFXLauncher.java

@@ -1856,16 +1856,30 @@ public class JFXLauncher extends Application {
             if (inst.isServerPack()) { sendJson(exchange, Map.of("success", false, "error", "Cannot toggle mods in server pack (only whitelist)")); return; }
             Path modsDir = inst.getPath().resolve("mods");
             Path src = modsDir.resolve(file);
-            if (!Files.exists(src)) { sendJson(exchange, Map.of("success", false, "error", "File not found")); return; }
+            if (!Files.exists(src)) {
+                // Try alternative name (enable: caller may send base name without .disabled)
+                String alt = enable ? file + ".disabled" : file.replace(".disabled", "");
+                Path altSrc = modsDir.resolve(alt);
+                if (Files.exists(altSrc)) src = altSrc;
+                else if (enable && file.endsWith(".jar")) {
+                    Path disabledSrc = modsDir.resolve(file + ".disabled");
+                    if (Files.exists(disabledSrc)) src = disabledSrc;
+                    else { sendJson(exchange, Map.of("success", false, "error", "File not found: " + file)); return; }
+                    file = file + ".disabled";
+                } else { sendJson(exchange, Map.of("success", false, "error", "File not found: " + file)); return; }
+            }
             Path dst;
             if (enable) {
                 if (file.endsWith(".disabled")) dst = modsDir.resolve(file.substring(0, file.length()-9));
+                else if (src.getFileName().toString().endsWith(".disabled")) dst = modsDir.resolve(src.getFileName().toString().replace(".disabled", ""));
                 else { sendJson(exchange, Map.of("success", true)); return; }
             } else {
                 if (file.endsWith(".jar")) dst = modsDir.resolve(file + ".disabled");
+                else if (src.getFileName().toString().endsWith(".jar")) dst = modsDir.resolve(src.getFileName().toString() + ".disabled");
                 else { sendJson(exchange, Map.of("success", true)); return; }
             }
-            Files.move(src, dst);
+            if (Files.exists(dst)) Files.delete(dst);
+            Files.move(src, dst, java.nio.file.StandardCopyOption.REPLACE_EXISTING);
             sendJson(exchange, Map.of("success", true));
         } catch (Exception e) { sendJson(exchange, Map.of("success", false, "error", e.getMessage())); }
     }

launcher/pom.xml

@@ -20,7 +20,7 @@
 
     <properties>
         <revision>1.1.1</revision>
-        <hotfix>2</hotfix>
+        <hotfix>3</hotfix>
         <maven.compiler.source>21</maven.compiler.source>
         <maven.compiler.target>21</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

server/main.py

@@ -43,7 +43,7 @@ logger = structlog.get_logger(__name__)
 # Cache for manifests - expires after 5 minutes
 manifest_cache = TTLCache(maxsize=100, ttl=300)
 
-BUILDS_DIR = Path("builds")
+BUILDS_DIR = Path(__file__).parent / "builds"
 VERSIONS_DIR = BUILDS_DIR / "versions"
 WHITELIST_DIR = Path(__file__).parent / "whitelist"
 
@@ -1813,6 +1813,43 @@ async def download_jre(request: Request):
             return await send_file_async(pp, request, content_type="application/zip", cache=True)
     raise HTTPException(404, "JRE zip not found on server")
 
+def _find_latest_setup(pattern: str) -> Path | None:
+    """Find latest Go setup exe by pattern (Online/Offline)"""
+    cands = list(BUILDS_DIR.glob(pattern))
+    if not cands:
+        return None
+    # sort by version key from filename
+    def ver_key(p: Path):
+        # ZernMC-Online-Setup-1.1.1.2.exe -> 1.1.1.2
+        name = p.stem
+        ver = name.split("-")[-1]
+        try:
+            return tuple(int(x) for x in ver.split("."))
+        except:
+            return (0,)
+    cands.sort(key=ver_key, reverse=True)
+    return cands[0]
+
+@app.get("/launcher/download/online")
+async def download_online_setup(request: Request):
+    """Download online Go installer (5.8M, STANDALONE EXE without bundled JRE)"""
+    p = _find_latest_setup("ZernMC-Online-Setup-*.exe")
+    if p and p.exists():
+        return await send_file_async(p, request, content_type="application/vnd.microsoft.portable-executable", cache=True)
+    raise HTTPException(404, "Online installer not found")
+
+@app.get("/launcher/download/offline-setup")
+async def download_offline_setup(request: Request):
+    """Download offline Go installer (STANDALONE EXE with embedded build, ~100M)"""
+    p = _find_latest_setup("ZernMC-Offline-Setup-*.exe")
+    if p and p.exists():
+        return await send_file_async(p, request, content_type="application/vnd.microsoft.portable-executable", cache=True)
+    # fallback: try legacy offline zip embed name without -Setup
+    p2 = _find_latest_setup("ZernMC-Offline-*.exe")
+    if p2 and p2.exists():
+        return await send_file_async(p2, request, content_type="application/vnd.microsoft.portable-executable", cache=True)
+    raise HTTPException(404, "Offline installer not found")
+
 @app.get("/launcher/download/zip/{filename}")
 async def download_launcher_zip(filename: str, request: Request = None):
     """Download specific launcher ZIP archive"""

server/site/index.html

@@ -383,11 +383,11 @@
         </div>
       </div>
       <div style="display:grid;grid-template-columns:1fr 1fr;gap:12px">
-        <a class="btn btn-primary btn-block" id="download-online-btn" href="/launcher/download/jre" download>
+        <a class="btn btn-primary btn-block" id="download-online-btn" href="/launcher/download/online" download>
           <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.2"><path d="M12 3v12"/><path d="m7 10 5 5 5-5"/><path d="M4 21h16"/></svg>
           <span>Online Setup (5.8М)</span>
         </a>
-        <a class="btn btn-ghost btn-block" id="download-offline-btn" href="/launcher/download/latest">
+        <a class="btn btn-ghost btn-block" id="download-offline-btn" href="/launcher/download/offline-setup">
           <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.2"><path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"/><polyline points="7 10 12 15 17 10"/><line x1="12" y1="15" x2="12" y2="3"/></svg>
           <span>Offline ZIP (98М)</span>
         </a>

server/site/js/main.js

@@ -345,16 +345,12 @@
         // online setup is Go exe (~5.8M) — try to discover via /launcher/version or static name
         try {
           const v = version && version !== '—' ? version : '1.1.1.2';
-          dlOnline.href = API + '/launcher/download/jre'; // JRE endpoint validated, exe name is ZernMC-Online-Setup-<ver>.exe
+          dlOnline.href = API + '/launcher/download/online';
           dlOnline.setAttribute('data-version', v);
-          // probe if online exe exists
-          fetch(API + '/launcher/file/' + v + '/ZernMC-Online-Setup-' + v + '.exe', {method:'HEAD'}).then(r=>{
-            if (r.ok) dlOnline.href = API + '/launcher/file/' + v + '/ZernMC-Online-Setup-' + v + '.exe';
-          }).catch(()=>{});
         } catch(e){}
       }
+      if (dlOffline) dlOffline.href = API + '/launcher/download/offline-setup';
       if (dlOffline && data.new_format && data.new_format.download_url) {
-        dlOffline.href = API + data.new_format.download_url;
       }
     } catch (e) {
       console.warn('[site] failed to load launcher info', e);