I surrender! - I have installed and reinstalled the CJForums - they work - but the "My Stuff' - My Profile and My Reputation links result in a 500 error (Huge white screen with a zero) - I do NOT get the 'nice' user page that the demo shows..
Latest Joomla php 7.2 - warp template - and YEARS of experience installing Joomla apps.. I surrender!
Hang on to the ones who love you!