Hi I have seen similar issues with what I am experiencing, as mentioned have tried the cleaner tool, however I have not resolved the problem of not being able to uninstall my lightroom on my computer.... I think the root issue may be that I reinstalled a new version before completely deleting the previous version... Is there any way to completely erase any registries or residue files that may cause the problem?
I would put both versions back and then uninstall both then install just the newer one.
It’s the uninstaller’s job to remove files. If they’ve half-been removed then maybe the uninstaller doesn’t have enough information to work with, and only by installing the same version, again, can you give the installer all the information.