When the installation program reaches the point where it does the backup, the RadarOpus exe file and system files have already been replaced.
When RadarOpus tells you that it cannot do the backup, do you want to continue, click on no to stop the installation program and start RadarOpus, it will be version 1.32
Click on Tools -> Database Management -> Backup and do the backup
Once the backup is finished, close RadarOpus and start the installation again.
Once the program is completely installed, restore the backup