Thank you for your reply
I don’t know how to install the Dev version.
It is not possible to upload while the existing version is in place either active or inactive and I am reluctant to delete and lose any current data.
Just in case, you are still stuck in that problem:
1. Deactivate and uninstall the present version of UMP (No, it won’t delete any data. But for safety, you should make a backup through UMP export).
2. Download, upload and install the Dev/new version of UMP.