This usually happens, either the advertising plug-in has been inserted into the installed software of the mobile phone, or the advertising plug-in has been inserted into your updated version, so there will be a prompt.

A package with the same name with a signature conflict has already been installed.

Many times there is something wrong with your updated version, and advertisements have been inserted. If you insist on updating this version, you can install the new version by uninstalling the old version, but all previous game progress will be lost.