Zyzzyva1711 has restored the old version of the game, which you can play here. This means that any runs completed on this version of the game can be submitted to legacy categories if applicable. If the level you are running was not changed by the update, then runs completed in the legacy version can be submitted to the normal category.

He has also added an in-game timer, and an autosplitter which can be used by going to https://robloxspeedrunning.com/autosplitter/ and following the instructions on https://robloxspeedrunning.com/autosplitter/docs. Other than these features, the game works exactly the same as the legacy version.

Merry Christmas to those who celebrate :)