The installation of CCleaner Pro Version 6.39 went smoothly. However, when I try to reopen the application by clicking on its desktop icon, it reinstalls CCleaner, but the free version that I previously uninstalled.
Do you have a solution to this problem? Thank you for your help.
Are you meaning that you have rolled back fron CCleaner 7 to CCleaner v6.39?
Simply go to Options > License key and enter your existing licence key to Activate CCleaner v 6.39 as Professional.
If you need to look up your CCleaner licence key then use this tool: CCleaner.com - License Lookup
If however you mean that it is updating itself to CCleaner 7 again then carefully follow the instructions here and turn off the automatic updating of v6.39.
How to Roll Back from v7 to v6.39