KB4166: Upgrading/Uninstalling Veeam Backup & Replication ...
https://www.veeam.com/kb416618.05.2021 · The message "Warning 1327.Invalid Drive" occurs during the upgrade process when the installer is on the stage of "Installing Veeam Backup Catalog..." Check the registry value named CatalogPath found in the key HLM\SOFTWARE\Veeam\Veeam Backup Catalog The value's data should be a path to an existing drive letter. If the drive letter shown does not exist, edit the entry …