No you do not have to uninstall to update. The updates will not overwrite your data files so after you have registered the software, the updates will save all your information.
I just uploaded the update that has the changes we discussed that corrected your issue. The good news is that the changes won't affect any systems that didn't need the change.
I just realized that I neglected to update the version number but the changes are there. Just Generate a g-code and look for M02 at the end. If it's there then you have the new version.
I think I am getting very close to releasing it.