The usage effect: it can remove the buffer advertisement, picture advertisements at the top and bottom of the main interface, text advertisements, and picture advertisements on the right side of the media library! (Pavel's style has always been thorough without leaving any blind spots.) The auto-update function can be switched on or off at will. Regarding compatibility issues, I don't have very old versions in hand, but both 5.4.1217 and the latest 5.4.1219 work fine. In theory, they are all compatible. However, some UUSee versions released by netizens that have been packed cannot use this patch, so it is still recommended to use the official installation version. After installation, run this patch afterward.