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Latest Version: 3.2
OS: Win95/98/ME and Windows NT/2000/XP
PROGRESS versions: V8.2 to V10.x
VIPER Download - Free testversion!

This free version differs from the full version by a nag screen – which states that the current installation is unregistered.

If you would like to test Viper4Unix, first download and install Viper for development (Windows) from here. Then send a mail to with information about the target platform and your interest in testing Viper 4 Unix..

The current version of VIPER has a file size of about 10 MB.
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