You can totally install it anywhere you have permission to

setup.iss

@@ -58,14 +58,3 @@ Name: "{autodesktop}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; Tasks: de
 [Run]
 Filename: "{app}\{#MyAppExeName}"; Description: "{cm:LaunchProgram,{#StringChange(MyAppName, '&', '&&')}}"; Flags: skipifnotsilent nowait
 Filename: "{app}\{#MyAppExeName}"; Description: "{cm:LaunchProgram,{#StringChange(MyAppName, '&', '&&')}}"; Flags: skipifsilent nowait postinstall
-
-[Code]
-function NextButtonClick(PageId: Integer): Boolean;
-begin
-    Result := True;
-    if (PageId = wpSelectDir) and (FileExists(ExpandConstant('{app}\WotwRando.exe')) or FileExists(ExpandConstant('{app}\..\WotwRando.exe'))) then begin
-        MsgBox('Unfortunately, it is not possible to install the new version to the same directory as before. It is recommended to install it to the default location. We will automatically import your settings if you updated from the old version.', mbError, MB_OK);
-        Result := False;
-        exit;
-    end;
-end;