The blue link to upgrade is not working
This could indicate that the Google Play Services and/or Google Play Store are not installed or working correctly; you can visit here: https://www.nextpit.com/install-google-play-services-apk for some information about installing the Google Play Services.
If you continue having trouble upgrading, please contact our support team via the Contact Us form located here: https://support.piriform.com/hc/en-us/requests/new?ticket_form_id=86507 or by emailing support@ccleaner.com directly; please include a screenshot(s) illustrating the problem you're experiencing so we can assist further.