Many authorized resellers offer heavily discounted OEM keys that provide a legal, permanent activation for a few dollars.
WAT is integrated into the Windows kernel. When you patch kernel-level files, you risk triggering a access violation or a STOP: c000021a Blue Screen of Death (BSOD). Many users report that after running version 2.2.7, their computer refuses to boot past the "Starting Windows" logo.
The search for "removewat 2.2.7 download" is a search for a shortcut. Today, that shortcut leads directly to malware, data theft, and unstable PCs. Microsoft has made Windows incredibly accessible—free with a watermark, or cheap via discounted keys.
RemoveWAT 2.2.7 does not include a reliable uninstaller. To revert the changes, you would need to perform a "System Restore" (if you created a restore point) or, more commonly, perform a full OS reinstallation.