Every time I try and play a solo match, without fail I will get a Runtime Error after a few minutes. I never have this issue when playing co-op (however I haven't been the host for co-op since I started playing again recently) and I never had this issue when I played a ton between 2015 to 2018. I've tried validating my game files already and that did nothing. If anyone could give me some help I would greatly appreciate it.

Hi. Do you have that error message of Runtime Error? Also. Let's try installing Visual C++. Try uninstalling all of your Microsoft Visual C++ first, then download all versions from https://www.techpowerup.com/download/visual-c-redistributable-runtime-package-all-in-one and reinstall them. Start with the oldest version first (2005 x86). Let us know if this helps or not.

Also. Update your Windows OS if you can in case some important programs are missing.