About a quarter of the students are getting the message “You are forbidden from performing this action on github.com” when they try to check out an assignment. This may be due to not yet approving your email account in GitHub, but it may be a different issue. GitHub knows about this but doesn’t have a fix yet. In the meantime, if there’s an assignment you want to do but can’t, instead go to https://github.com/PhyloMeth, go to the appropriate assignment, click Fork (button in upper right), then make (and commit and push) changes in your fork of the assignment, then do a pull request so I can see your work. My apologies for this issue.