1- Install the program - double click on "Proteus 8 Professional Setup.exe"
2- Do not launch the program. If launched then exit.
3- Copy "BIN" To Installation Folder "C:Program FilesLabcenter ElectronicsProteus 8 Professional"
4- Copy "MODELS" To Programs data folder for XP: C:Documents and SettingsAll UsersApplication DataLabcenter ElectronicsProteus 8 Professional for Vista - 7 - 8: C:ProgramDataLabcenter ElectronicsProteus 8 Professional
5- Done.. Run Proteus 8.1 and enjoy the full release!