How do I get past the intrusive "upgrade" popup when using CCleaner Free?

CCLeaner Free user with a Windows 10 machine (which is on its last legs so I do **NOT** want to upgrade to CCleaner Pro). There are about 4GB of removable files, but attempting to run CCLeaner Free to remove them results in a popup which has a very prominent UPGRADE button and apparently no button to use Free for the (basic) cleanup required.

Any suggestions (other than upgrade)?

For info: the popup shows a tick under Basic Cleaning in the Free version. But no button which enables me to use it.

Read here

https://community.ccleaner.com/topic/67171-ccleaner-62411060-will-not-do-a-custom-clean/

Yes you can.

helpful