why cant we submit speedruns in different versions of project 64
Because other versions and emulators aren't as accurate.
What's your problem with using the right version?
Replacing Expiring Twitch VODs
If you wish to replace your twitch highlights with reuploads, please edit your already verified run rather than deleting the verified run and making a new submission. This makes it a lot easier for us to track which submissions are reuploads and should be less work on your part as well.
If you need
Recent runs