Archive and reupload Unity Collab project

Hi everybody!

I have a project on Unity Collab, but recently when a friend tried to upgrade it (he didn't upgraded by months), he got a lot of script related errors when these were the same as mine. I decided to kill the project by archiving it, and reuploading the entire thing. I did this with another project that almost went corrupt by uploading an older version, but for some reason, I can't do that now. Everytime I try, the message of "Your repository is locked" appears. What can I do to solve that?