Installing 1.0.0a1 went fine and I rebuilt one project without issue.
One small legacy issue that may exist for some is the following: Before I had installed a virtual python environment (months ago), I had installed pretext both as root (to give global access to directories), and then also as an (unprivileged) user.
In particular, installing as an unprivileged user adds several directories to /home/user/.local/... I had at some point needed to add /home/user/.local/bin to my path.
When I executed pip uninstall pretextbook (as user), it removed the binary from user/.local/bin and reinstalling does not put it back there. It was easy enough to fix the path, but if user is not using a virtual environment and follows those instructions, pretext --version will fail with the binary not found.
As I said, pushing the use of the virtual environment will probably remove this issue for most, but on dedicated workstations, I really have no need of a virtual environment, so others may experience a hiccup.