you need both the installation exe and the keygenerator exe.
run the installation exe, you should get some default path like C:\Program Files\SD-Techmanager7000. Click on the icon to finalise installation.
If you get some messages about files being older than those on your pc click on "Nein" to keep the newer files. (this program is after all some years old!)
run the keygenerator exe, enter
Password : soerenberg
Liberation Key Length : 16
Software code : read from the program installation message, Help menu, info, under version no, and enter.
If the English menus do not appear by default after selecting the Union Jack,
Menu, Programm, Sprachwahl, select English.