Cannot sign into Sourcetree via Bitbucket

I was trying to add a new remote repository, when I got this error:

So I tried to sign in, and I got this:

Interestingly, though, when I clicked on the hamburger menu, I was signed in and was able to see the "Your work" section with my pull requests and everything. So I hit cancel. I got the error message of "Refreshing Remote Repositories Failed" again, so I signed in again, and this time it went straight to the "Your work" section of bitbucket. There wasn't anything I could do except click around the website or hit cancel. So I hit cancel, but then I still wasn't signed in. So I quit Sourcetree and opened it again, and then I got that error message of "Refreshing Remote Repositories Failed" again. I tried to sign in again, and this time, I got this:

which was the same "Your work" screen again, except this time it said I was connected. But there was still nothing for me to do except click around or hit cancel! And when I hit cancel, it said I was still not signed in!

As a side note, when I went to the support page for bitbucket:

the link that says "Download the latest version for macOS" is broken: