Walkthroughs - Many known bugs are covered on my walkthrough pages. Bug notes are in hot pink text to make them easy to find without necessarily having to read game spoilers. Where I am aware of solutions for a particular bug, I have included them.
Manuals and 'readme' files - Most of the games include a printed manual or a text/PDF file with instructions and support info. If you're having trouble installing or running a game, start there. Follow this link for PDF manuals.
My Downloads Pages - These include information on patches and other utilities for the PC and Macintosh version of each game. Some bugs and technical issues can be fixed with patches. This link is to the TR1 page, where you'll find links to separate pages for the other games. These pages also include tips for installing and running the classic Tomb Raider games with newer versions of Windows.
Save Files - On the PC and Macintosh, it's often possible to bypass bugs or other difficult spots by downloading a savegame file from a location farther along in the game. I also have save files for PlayStation, PSP and Nintendo Wii for some of the games.
Aspyr Tech Support - For Tomb Raider I-III Remastered.
Crystal Dynamics Tech Support - This site includes limited support for the Survivor trilogy. Since Square Enix no longer owns Tomb Raider, it can be difficult to get developer/publisher support at the time of this writing.
Tomb Raider Forums Tech Support Section - This unofficial fan site is frequented by tech-savvy raiders so you may find answers here. Again, be sure to search for answers before posting, be polite and include specifics about your system and the issue you're having. You'll get more useful answers if you do.
I also recommend contacting support services for your platform (Steam, Xbox, Playstation, etc.), as well as peer-to-peer support on social media, Steam Community Discussions, etc. You're welcome to tag me in a Twitter post, and I'll try to crowdsource a solution.