A legal up to date Grand Theft Auto V copy is required to play Rage Multiplayer
If you pirated the game, there's no fix, buy the game as Rage Multiplayer does not support pirated versions of the game.
Try all of these following steps, not everything in this list will help, but 90% of the time one of these will resolve your issue
Verify your game files,
Make sure you have a clean game, no mods should be installed (To make troubleshooting easier)
Reinstall GTA V or verify the files through Steam/Social Club
Run RageMP with Admin rights
Make sure you have the required redistributables (This and This)
Install RageMP and GTA V on the same drive
Install RageMP and GTA V on different drives.
Disable any overlays (For example, Steam overlay, OBS, Discord overlay, Overwolf).
Make sure you have a save file(started Singleplayer and saved the game).
Uninstall all other GTA V Multiplayer Mods.
Disable your firewall/antivirus or add an exception to your firewall or antivirus so it doesn't do anything to the RageMP exe files
Right click on ragemp.exe and select Troubleshoot compatibility
(NVIDIA USERS) Disable Shadowplay
(STEAM ONLY) Completely close Steam, and then launch RageMP and let RageMP open Steam.
Go into your game folder and delete 'GTA5.exe' and then use 'PlayGTA5.exe' and run the game. After this you may be able to play RAGEMP.
Disable any antivirus software or add an exception in your antivirus to not do anything with RageMP files on your computer and try to install Rage again. This error is most common with users antivirus software removing RageMP files.
If disabling your antivirus/windows defender still doesn't fix this, right click on RageMP and select 'Troubleshoot compatibility'. This has also been said to fix the issue
ERROR: Your game version is not supported by RAGE Multiplayer.
If GTA V has just updated, this error will show, wait for RageMP to update, if there has been no update, upgrade your GTA V version as you're running an outdated version. https://support.rockstargames.com/hc/en-us/articles/115014280127-Verifying-system-files-on-your-PC-for-GTAV
System.UnauthorizedAccessException: Access to the path '...' is denied
Run RageMP as an administrator.
The code execution cannot proceed because MSVCP140.dll was not found
Install the below 2 packages https://www.microsoft.com/en-US/download/details.aspx?id=52685 https://www.microsoft.com/en-us/download/details.aspx?id=53344&desc=dotnet462
System.Net.WebException: The remote server returned an error: (522) Origin Connection Time-out.
Happens when the servers are down, keep checking back or wait for an announcement to let you know when they're back online.
Right now there isn't a clear answer in this, however, some have fixed by allowing RageMP through their firewall, and some fixed it by closing all programs on their computer to free up their RAM/CPU and then loading into a server.
As of ~0.3.6: If you're a Windows 8/8.1 user you'll experience this, no fix for this as of yet as it may be software not supporting Windows 8
Game launching into Singleplayer
(Steam Version) Completely quit Steam, then run RageMP and let RageMP launch steam and the game and you should load into the game. This, however, doesn't always work for Steam users but has worked for some.
Make sure you have the Visual C++ redistributable 2015 (https://www.microsoft.com/en-us/download/details.aspx?id=48145)
Game is crashing before it's even launched
Some players have reported if you have another GTA V Multiplayer Mod installed inside your GTA V folder, you should remove this and it has been known to fix this issue.
NVIDIA USERS: Disable Nvidia Shadowplay and see if that stops the crashing, some players have reported issues with this.
Game is crashing once I join a server(As soon as it says 'Multiplayer started')
Try moving your RageMP to a different drive (For example, from C:\ to D:\)
If the server has voice chat, disable anything that may be blocking your microphone or any voice changers, this causes you to crash.
System.Net.WebException: The remote server returned an error: (403) Forbidden
Your IP is blocked and if it isn't done on purpose, you should use a VPN to view the master list. You can disable it once you begin connecting to a server.
Failed to retrieve the install directory
This can occur if you've selected the wrong directory, or possibly that you have an outdated GTAV.exe/GTA V files. Make sure you're selecting the right directory, it should contain your GTAV.exe file. If you're sure it's the right directory, it has been said that you can try reverifying your game files as you may have an outdated/corrupt/modified GTAV.exe that RageMP isn't picking up.
RageMP freezes each time I click on a server
This happens when the directory you've selected doesn't contain a GTAV.exe most of the time. Another reason can be that if you have a Steam version, that you aren't logged into Steam so it's unable to launch GTA V.
I launch RageMP and nothing happens
Disable your antivirus, this can happen when you're missing files. If you don't have one installed, try reinstalling RageMP again.
I'm getting frameskipping while playing on any server
If you run autohotkey, try turning it off before launching RageMP. If you run on a 144Hz monitor, lowering your FPS/Hz to 60 seems to stop this from happening.
GTA V starts up with a black screen and then suddenly closes/crashes after clicking 'Play Now'
If this is the first time ever using RageMP or you have just reinstalled RageMP, this will make your client crash as the 'Play Now' button is used to reconnect to your last connected server. Please use the 'Servers' tab or the 'Direct Connect' tab to join a server first, then you can use the Play Now button to reconnect to your last joined server.
My game is crashing when I'm out there the construction zone/middle of Los Santos
This is a known crash zone, look at the image below to confirm you're crashing in this area. However, it is possible to get this fixed by doing the following
Go to Documents / Rockstar Games / GTA V / Profiles
Highlight all of the folders
Optional: Send to -> Compressed folder (zip) [So you don't lose your campaign progress]
Delete all of the folders
Restart your Game
When you restart, it will ask where to get your save file from, click 'Local Only'
Map of the crash zone