Just notified that update 5.78 is available for CCleaner Pro (I'm on CCleaner Pro 5.77, on win 10 home) clicked update, appeared to download then nothing - no install - it just shut down. Back to Desktop. Odd - that never happened with you guys before. Went to CCleaner folder in File Explorer and there was a temp update folder for update 5.78 there with an application file inside. Ran it (as admin) and it asked me to confirm that the app could make changes, yes, and then ran as expected as it installed, presumably 5.78. Completed. Then nothing - back to desktop. Usually the installer opens up