Corel has indeed done something to the software itself ... something minor, but that's all it took. When you start up the Corel version of Bryce, you see the Corel logo, and the menu options are changed to point to Corel's website. Both of these changes occurred in files that the patch program apparently wants to update (such as "menus.dat"). The patch program then sees those files as an invalid version (since they need to be byte-for-byte exact before a patch programs will work) and just gives up on the process. Also, the Corel Bryce 4 EXE may not be precisely the same as the Meta Bryce 4 EXE in some other minor unknown ways, as the version numbers are also different. (Bryce's original release was 4,0,0,16, whereas the Corel release is 4,0,0,13.)