If you saw Reddit posts claiming “working keys,” they are either fake, expired, or malicious. Many such posts are bots or scams.

: Once purchased, your unique license key is sent to the email address used during checkout. In-App Activation : Open the Combo Cleaner application.

The post was from a user named "PCproblems", who claimed to have found a working activation key for Combo Cleaner, a popular PC cleaning and optimization software. Combo Cleaner was known for its ability to remove malware, junk files, and other unwanted data from computers, but it required an activation key to unlock its full features.