If you are encountering issues where your game looks different from everyone else's, your textures are black & pink, or have errors everywhere, then you're in the right place. This is an in-depth guide that should cover most if not all aspects in solving a buggy game.
If you are having trouble understanding something, you may also start a private message with any staff member on the forums.
Before you start, if you have addons you don't want to uninstall or disable, then this guide may have limited positive effect on your game!
Please also check your settings. If model detail is not set to High then cars in-game will look like spikes and spaghetti. This is not considered an issue with the content pack.
To start fixing your game, it is highly recommended that you uninstall all of your addons. You'll want to do this if you want to keep things simple and straight forward.
There is a simple way to unsubscribe from all of your addons at once, as shown below.
Having followed these instructions, you are going to want to quit the game, if you haven't already. Then, purge your Garry's Mod folder of any remaining downloaded content.
To do this, you can right click your game in your library, click properties, local files and then Browse to be taken directly to your Garry's Mod directory.
Now click on the garrysmod folder and open it, and then you're ready for the next step.
With your Garry's Mod directory open, select the following folders by holding CTRL and clicking on them to select several at once:
addons download downloads maps models materials
If any of these exist in the Steam\steamapps\common\GarrysMod\garrysmod directory, hit delete on them. After selecting all of them, hit delete.
Deleting these folders will remove any files that remained after you unsubscribed from your addons. If you don't have one or more of these folders it's not a problem, just delete the rest. After doing this you'll want to launch Garry's Mod. The game will create new folders for the ones that were deleted, and you can now subscribe to the PerpHeads content.
Now for the easiest part. Install the content using clicking on this link. You may need to log in to steam if you're opening in an external web browser. Once your download has completed, you can proceed to the next step.
After having done all this, you are ready to join the server. There are multiple ways to do this. You can now:
Press the tilde key (default keybinding) and your console will appear.
If you're running Garry's Mod on 64-bit chromium, you may be unable to open your console in the main menu, simply start a sandbox game then open the console, or join via a friend from your friends list.
If you've got to the end of this guide, and you still have issues with your content, then you should create a support post over on the forums or join the Discord Server and post a message in #help-and-support.