I installed version 2.3 on a Windows 8.1 64bits machine: I ended up with incomplete immunization.
Spybot cannot immunize Cookies of Opera 20.01.387.91

Further I installed the program in the German language, but not all messages are in German.

I have 2 computers in my network running Windows and two licenses to Spybot. Although the second computer was not running, spybot complained about having recognized 2 computers running Spybot and hinted to a breach of license when I tried to upgrade from Spybot 2.2 to 2.3.