CAESAR II Version 4.30 was released in March of 2001 - long before Vista was even a twinkle in Microsoft's eye.
We have only tested Versions 5.00 and 5.10 under Vista. However, I see no reason why Version 4.30 would not install or run under Vista
except for the ESL driver. I suggest you visit Aladdin's website at
http://www.aks.com/ and download the latest driver which will be compatible with Vista.
If you're having specific problems, please provide details.
(Why are you still running Version 4.30, your Codes are six years out of date?)