Good news...I pushed out the previously planned V1.0.2 enhancements to V1.0.3 and did a simple rename of the themes back to their original names and now the upgrade process works as you would expect.
So...upgrade away..V1.0.2 is now available at https://backstopthemes.com :-)
Remember to always upgrade with caution. Backup your system before the upgrade and be prepared to restore the pre-upgrade version if things don't go the way you expect.
Updates have also been pushed to the GitLab repository at https://gitlab.com/BackStopThemes