where is downpatching allowed? is it any category or only categories where the wr is only beatable with an older version?
Down patching is allowed for every level run, multi-level runs are a bit more complex but the limits for those categories are just that you cant down patch to a version that does not have required levels for the run (For Ex: Currently fullgame categories can go to the day 1 patch of Violence but they cannot go to a version that existed without Violence.)
If you have not seen ULTRAKILL is finally having a speedrunner competition for real money!!! It starts in about four hours from the time I am making this news post, in fact its probably already started when you are reading this so click the challenges widget on the right and read up on the rules and