This information is very important for everyone who has uploaded mods to Street Legal workshop.
When you're preparing your mod for uploading, you must keep directory structure of the game.
EXAMPLE
You're adding a car that consists of the following files and directories:
[DIR] Audi_TT_2006
[FILE] Audi_TT_2006.rpk
The game will recognize this car only if folder Audi_TT_2006 and
file Audi_TT_2006.rpk will be placed in cars/racers directory. The file structure will look like this:
[DIR] cars/racers/Audi_TT_2006
[FILE] cars/racers/Audi_TT_2006.rpk
Now imagine that there's an automatic tool that will not read the instruction and just copy the files right into the game folder. Of course, this car will not work after that. To avoid this situation, you need to recreate folder structure like your mod is already installed into the game and copy it to content folder of workshop uploader.
If your mod is replacing original game files, it's ok, installation tool will leave their backups. Just put them into right folders, otherwise they will not work after installation.
WARNING
We will review all existing workshop items to check if they're compatible with our installation tool. If you'll receive a message from Valve with something like "your workshop item is banned", don't panic, we have to mark incompatible items as banned for making them invisible for the installer. After an item got banned, you'll need to modify its folder structure and reupload it to Steam again.
Installation tool will become available in build 926.