You would need to file a help request. <a href="https://help.roll20.net/hc/en-us/requests/new?ticket_form_id=360005888994" rel="nofollow">https://help.roll20.net/hc/en-us/requests/new?ticket_form_id=360005888994</a> My guess is that they might not be able to help though. The Pro rollback only works for 7 days back, so it might not be possible to go 6 months back, even for Roll20 staff. You might be pleasantly surprised though, so it never hurts to ask. Make sure to put as much information into the support request as possible, and an old join link or link to the game's landing page would help them identify the game.