NovaBACKUP PC/Server/BE v19.x and newer (2019-04-15)
If you execute the NovaBACKUP installer it asks for a temp path with temp installer files.
Copy the path out of the dialog.
Open the Registry Editor (regedit.exe) and open the "Search" dialog.
Copy the path into the search mask and search for the path.
Delete the subkey that contains this path.
Leave the registry open and restart the NovaBACKUP Installer.
It should now start without asking for a temp directory.
If it asks again for the temp path search and delete it again.