If I remember correctly, I had version 5 installed, then had a version 6 upgrade, which was working fine, and the one that broke the software was v6.1.8. When I went to clean out ubot registries to do a new install, I did notice I had version 5 and 6 installed, but I've been using it with version 6, so no conflict problems. For the new install, I found an old v5.5.11, so I uninstalled ubot, deleted roaming ubot files in user account, cleaned out ubot registries, rebooted, checked if any remaining ubot registries were still showing and then re-installed ubot with v.5.5.11. All that and I st