With *an* admin prompt

.editorconfig

@@ -4,7 +4,7 @@ root = true
 [*]
 charset = utf-8
 indent_style = space
-indent_size = 2
+indent_size = 4
 end_of_line = lf
 insert_final_newline = true
 trim_trailing_whitespace = true
@@ -13,6 +13,3 @@ max_line_length = 100
 [*.md]
 max_line_length = off
 trim_trailing_whitespace = false
-
-[*.{rs,java,kts}]
-indent_size = 4

apps/app/nsis/hooks.nsi

@@ -1,41 +1,67 @@
-!macro NSIS_HOOK_POSTINSTALL
-    SetShellVarContext current
-
-    IfFileExists "$LOCALAPPDATA${PRODUCTNAME}\theseus_gui.exe" file_found file_not_found
-    file_found:
-        Delete "$LOCALAPPDATA${PRODUCTNAME}\theseus_gui.exe"
-
-        Delete "$LOCALAPPDATA${PRODUCTNAME}\uninstall.exe"
-        RMDir "$LOCALAPPDATA${PRODUCTNAME}"
-
-        !insertmacro DeleteAppUserModelId
-
-        ; Remove start menu shortcut
-        !insertmacro MUI_STARTMENU_GETFOLDER Application $AppStartMenuFolder
-        !insertmacro IsShortcutTarget "$SMPROGRAMS$AppStartMenuFolder${PRODUCTNAME}.lnk" "$LOCALAPPDATA${PRODUCTNAME}\theseus_gui.exe"
-        Pop $0
-        ${If} $0 = 1
-          !insertmacro UnpinShortcut "$SMPROGRAMS$AppStartMenuFolder${PRODUCTNAME}.lnk"
-          Delete "$SMPROGRAMS$AppStartMenuFolder${PRODUCTNAME}.lnk"
-          RMDir "$SMPROGRAMS$AppStartMenuFolder"
+; https://nsis.sourceforge.io/ShellExecWait
+!macro ShellExecWait verb app param workdir show exitoutvar ;only app and show must be != "", every thing else is optional
+    #define SEE_MASK_NOCLOSEPROCESS 0x40
+    System::Store S
+    !if "${NSIS_PTR_SIZE}" > 4
+    !define /ReDef /math SYSSIZEOF_SHELLEXECUTEINFO 14 * ${NSIS_PTR_SIZE}
+    !else ifndef SYSSIZEOF_SHELLEXECUTEINFO
+    !define SYSSIZEOF_SHELLEXECUTEINFO 60
+    !endif
+    System::Call '*(&i${SYSSIZEOF_SHELLEXECUTEINFO})i.r0'
+    System::Call '*$0(i ${SYSSIZEOF_SHELLEXECUTEINFO},i 0x40,p $hwndparent,t "${verb}",t $\'${app}$\',t $\'${param}$\',t "${workdir}",i ${show})p.r0'
+    System::Call 'shell32::ShellExecuteEx(t)(pr0)i.r1 ?e' ; (t) to trigger A/W selection
+    ${If} $1 <> 0
+        System::Call '*$0(is,i,p,p,p,p,p,p,p,p,p,p,p,p,p.r1)' ;stack value not really used, just a fancy pop ;)
+        System::Call 'kernel32::WaitForSingleObject(pr1,i-1)'
+        System::Call 'kernel32::GetExitCodeProcess(pr1,*i.s)'
+        System::Call 'kernel32::CloseHandle(pr1)'
+    ${EndIf}
+    System::Free $0
+    !if "${exitoutvar}" == ""
+        pop $0
+    !endif
+    System::Store L
+    !if "${exitoutvar}" != ""
+        pop ${exitoutvar}
+    !endif
+!macroend
+
+; --------------------------------------------------------------------------------
+
+Var /GLOBAL OldInstallDir
+
+!macro NSIS_HOOK_PREINSTALL
+    SetShellVarContext all
+    ${If} ${FileExists} "$SMPROGRAMS\${PRODUCTNAME}.lnk"
+        UserInfo::GetAccountType
+        Pop $0
+        ${If} $0 != "Admin"
+            MessageBox MB_ICONINFORMATION|MB_OK "An old installation of the Modrinth App was detected that requires administrator permission to update from. You will be prompted with an admin prompt shortly."
+        ${EndIf}
+
+        ReadRegStr $4 SHCTX "${MANUPRODUCTKEY}" ""
+        ReadRegStr $R1 SHCTX "${UNINSTKEY}" "UninstallString"
+
+        ReadRegStr $OldInstallDir SHCTX "${UNINSTKEY}" "InstallLocation"
+        StrCpy $OldInstallDir $OldInstallDir "" 1
+        StrCpy $OldInstallDir $OldInstallDir -1 ""
+
+        DetailPrint "Executing $R1"
+        !insertmacro ShellExecWait "runas" '$R1' '/P _?=$4' "" ${SW_SHOW} $3
+        ${If} $3 <> 0
+            SetErrorLevel $3
+            MessageBox MB_ICONEXCLAMATION|MB_OK "Failed to uninstall old global installation"
+            Abort
+        ${EndIf}
+    ${EndIf}
+    SetShellVarContext current
+!macroend
+
+!macro NSIS_HOOK_POSTINSTALL
+    !insertmacro IsShortcutTarget "$DESKTOP\${PRODUCTNAME}.lnk" "$OldInstallDir\${MAINBINARYNAME}.exe"
+    Pop $0
+    ${If} $0 = 1
+        !insertmacro SetShortcutTarget "$DESKTOP\${PRODUCTNAME}.lnk" "$INSTDIR\${MAINBINARYNAME}.exe"
+        Return
     ${EndIf}
-        !insertmacro IsShortcutTarget "$SMPROGRAMS${PRODUCTNAME}.lnk" "$LOCALAPPDATA${PRODUCTNAME}\theseus_gui.exe"
-        Pop $0
-        ${If} $0 = 1
-          !insertmacro UnpinShortcut "$SMPROGRAMS${PRODUCTNAME}.lnk"
-          Delete "$SMPROGRAMS${PRODUCTNAME}.lnk"
-        ${EndIf}
-
-        !insertmacro IsShortcutTarget "$DESKTOP${PRODUCTNAME}.lnk" "$LOCALAPPDATA${PRODUCTNAME}\theseus_gui.exe"
-        Pop $0
-        ${If} $0 = 1
-          !insertmacro UnpinShortcut "$DESKTOP${PRODUCTNAME}.lnk"
-          Delete "$DESKTOP${PRODUCTNAME}.lnk"
-        ${EndIf}
-
-        DeleteRegKey HKCU "${UNINSTKEY}"
-
-        goto end_of_test ;<== important for not continuing on the else branch
-    file_not_found:
-    end_of_test:
 !macroend

apps/app/tauri.conf.json

@@ -15,7 +15,6 @@
     "icon": ["icons/128x128.png", "icons/128x128@2x.png", "icons/icon.icns", "icons/icon.ico"],
     "windows": {
       "nsis": {
-        "installMode": "perMachine",
         "installerHooks": "./nsis/hooks.nsi"
       }
     },