Topic like this - 

my forum moved from cp0x.com to cp0x.com/forum, conf_global.php was changed, my license url changed as well. Now works only main page

Be sure to update your .htaccess as it sounds like you have URL rewrites in place. Can get the new one from ACP -> System -> Search Engine Optimization -> URL Rewrites' description.

Thanks a lot, this is it!)

Glad to hear this is resolved 🙂