Index: source/main.cpp
===================================================================
--- source/main.cpp
+++ source/main.cpp
@@ -51,6 +51,7 @@
 #include "ps/Globals.h"
 #include "ps/Hotkey.h"
 #include "ps/Loader.h"
+#include "ps/Mod.h"
 #include "ps/ModInstaller.h"
 #include "ps/Profile.h"
 #include "ps/Profiler2.h"
@@ -547,6 +548,7 @@
 		g_VFS = CreateVfs();
 		g_VFS->Mount(L"cache/", paths.Cache(), VFS_MOUNT_ARCHIVABLE);
 		MountMods(paths, GetMods(args, INIT_MODS));
+		Mod::CacheEnabledModVersions(g_ScriptRuntime);
 
 		{
 			CReplayPlayer replay;
@@ -616,6 +618,7 @@
 				installer.Install(modPath, g_ScriptRuntime, true);
 
 			installedMods = installer.GetInstalledMods();
+			modsToInstall.clear();
 		}
 
 		if (isNonVisual)
@@ -632,9 +635,6 @@
 				Frame();
 		}
 
-		// Do not install mods again in case of restart (typically from the mod selector)
-		modsToInstall.clear();
-
 		Shutdown(0);
 		MainControllerShutdown();
 		flags &= ~INIT_MODS;
Index: source/ps/GameSetup/GameSetup.h
===================================================================
--- source/ps/GameSetup/GameSetup.h
+++ source/ps/GameSetup/GameSetup.h
@@ -33,6 +33,8 @@
  **/
 extern void EarlyInit();
 
+class ScriptRuntime;
+
 enum InitFlags
 {
 	// avoid setting a video mode / initializing OpenGL; assume that has
Index: source/ps/GameSetup/GameSetup.cpp
===================================================================
--- source/ps/GameSetup/GameSetup.cpp
+++ source/ps/GameSetup/GameSetup.cpp
@@ -80,6 +80,7 @@
 #include "scriptinterface/ScriptInterface.h"
 #include "scriptinterface/ScriptStats.h"
 #include "scriptinterface/ScriptConversions.h"
+#include "scriptinterface/ScriptRuntime.h"
 #include "simulation2/Simulation2.h"
 #include "lobby/IXmppClient.h"
 #include "soundmanager/scripting/JSInterface_Sound.h"
@@ -922,6 +923,8 @@
 	const int heapGrowthBytesGCTrigger = 20 * 1024 * 1024;
 	g_ScriptRuntime = ScriptInterface::CreateRuntime(shared_ptr<ScriptRuntime>(), runtimeSize, heapGrowthBytesGCTrigger);
 
+	Mod::CacheEnabledModVersions(g_ScriptRuntime);
+
 	// Special command-line mode to dump the entity schemas instead of running the game.
 	// (This must be done after loading VFS etc, but should be done before wasting time
 	// on anything else.)
Index: source/ps/Mod.h
===================================================================
--- source/ps/Mod.h
+++ source/ps/Mod.h
@@ -38,6 +38,8 @@
 	 */
 	JS::Value GetLoadedModsWithVersions(const ScriptInterface& scriptInterface);
 
+	void CacheEnabledModVersions(shared_ptr<ScriptRuntime> scriptRuntime);
+
 	/**
 	 * Gets info (version and mods loaded) on the running engine
 	 *
Index: source/ps/Mod.cpp
===================================================================
--- source/ps/Mod.cpp
+++ source/ps/Mod.cpp
@@ -31,6 +31,8 @@
 
 std::vector<CStr> g_modsLoaded;
 
+std::vector<std::vector<CStr8>> g_LoadedModVersions;
+
 CmdLineArgs g_args;
 
 JS::Value Mod::GetAvailableMods(const ScriptInterface& scriptInterface)
@@ -101,33 +103,50 @@
 	return JS::ObjectValue(*obj);
 }
 
-JS::Value Mod::GetLoadedModsWithVersions(const ScriptInterface& scriptInterface)
+void Mod::CacheEnabledModVersions(shared_ptr<ScriptRuntime> scriptRuntime)
 {
+	debug_printf("CacheEnabledModVersions\n");
+	debug_printf("1\n");
+	ScriptInterface scriptInterface("Engine", "CacheEnabledModVersions", scriptRuntime);
+	debug_printf("2\n");
 	JSContext* cx = scriptInterface.GetContext();
+	debug_printf("3\n");
 	JSAutoRequest rq(cx);
+	debug_printf("4\n");
 
 	JS::RootedValue availableMods(cx, GetAvailableMods(scriptInterface));
+	debug_printf("5\n");
 
-	JS::RootedValue ret(cx, JS::ObjectValue(*JS_NewArrayObject(cx, 0)));
+	g_LoadedModVersions.clear();
 
-	// Index of the created array
-	size_t j = 0;
 	for (size_t i = 0; i < g_modsLoaded.size(); ++i)
 	{
 		// Ignore user and mod mod as they are irrelevant for compatibility checks
 		if (g_modsLoaded[i] == "mod" || g_modsLoaded[i] == "user")
 			continue;
+
 		CStr version;
 		JS::RootedValue modData(cx);
 		if (scriptInterface.GetProperty(availableMods, g_modsLoaded[i].c_str(), &modData))
 			scriptInterface.GetProperty(modData, "version", version);
-		scriptInterface.SetPropertyInt(ret, j++, std::vector<CStr>{g_modsLoaded[i], version});
+
+		g_LoadedModVersions.push_back({g_modsLoaded[i], version});
 	}
-	return ret;
+}
+
+JS::Value Mod::GetLoadedModsWithVersions(const ScriptInterface& scriptInterface)
+{
+	debug_printf("GetLoadedModsWithVersions\n");
+	JSContext* cx = scriptInterface.GetContext();
+	JSAutoRequest rq(cx);
+	JS::RootedValue returnValue(cx);
+	scriptInterface.ToJSVal(cx, &returnValue, g_LoadedModVersions);
+	return returnValue;
 }
 
 JS::Value Mod::GetEngineInfo(const ScriptInterface& scriptInterface)
 {
+	debug_printf("GetEngineInfo\n");
 	JSContext* cx = scriptInterface.GetContext();
 	JSAutoRequest rq(cx);