To anyone experiencing the issue where the mod appears to install fine but seemingly has no effect on the game aside from the custom Sandbox Mod loading screens and backgrounds, here is a temporary workaround until a formal update for the mod is released.
Open the downloaded mod patch folder, find installerConfig.wmi, and open it in Notepad. Search for ALL instances of '510064564' and REPLACE them with '510117427'. Save the file and then run the installer as normal.
If you can't be arsed to do this, here is my own edited installerConfig.wmi, which has restored my Sandbox Mod to working order: Drive.google.com. Download it and replace the one that comes in the patch folder.
I have NOT tested whether this works if the mod is already installed. It may not, in which case you would first have to uninstall the mod first before editing the file and reinstalling. Make sure you take appropriate precautions (back up your decks!) before doing so; I won't be responsible for loss of data.
jefzwang
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