GreenLuma

Failed to run DLLInjector.exe

Make sure your antivirus is disable or make an exception for Playnite Addons folder (this is where GreenLuma store the files including DLLInjector) and Steam folder. For the Playnite Addons folder, you just need to exclude AppData\Roaming\Playnite\ExtensionsData\a237961d-d688-4be9-9576-fb635547f854, The directory may vary depending on whether your Playnite installation is portable or not.

Game starting without DLLInjector.exe on GreenLuma NormalMode

In addons settings, increase your Timeout in GreenLuma Tab. The default settings are 3 Seconds. Also this plugin does not work with Steam Launcher Utility plugin by darklinkpower

Goldberg

DLC/Others not working.

This issue is likely due to the plugin being unable to create a symlink steam_settings folder into the coldclient folder. Simply turn on Developer Mode in Windows Settings to allow users to create symlinks without running as Admin. Alternatively, you can run Playnite as an Administrator.