Open ptc_licfile.dat with your favorite txt-editor. You should run your favorite txt-editor in Administrator mode to make changes to proev.bat file or else you may not be able to save edited file.
Replace every occurrence of 00-0C-29-6B-23-E3 with the one shown in the bottom left corner of the Pro/e setup (it痴 your MAC-id, format: xx-xx-xx-xx-xx)