If you run ProGuard under OS/2's WIN-OS2 emulator, the
installation program may cause a sudden lockup of the entire system.
If you try the installation program, be sure all other windows are
closed and all files are saved. The manual installation procedure
is safe, will work, and probably is preferred in this case. ProGuard
itself will work without incident after a manual installation.
The deinstallation program also causes no problems.