The latest version of CAESAR II is "Version 5.10". What you have is a Beta Test copy of Version 5.20. Please understand the use of the word Test here - you could have issues with 5.20 and we want to know about them before we release this version.
As to the hardware requirements, CAESAR II is no longer the prime resource user. If you're satisfied with how Windows operates then CAESAR II should run fine. As a minimum though, I would recommend a 2+ Ghz processor, at least 2 Gbytes of RAM, a graphics card with 256+ Mbytes of RAM, and enough hard disk space that you don't run out.
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Regards,
Richard Ay - Consultant