hi Jiri,
CW10.6 can work for both 32bit and 64bit vista. here is the CW10.6 required Operating System.
Operating System Microsoft® Windows XP 32-bit and 64-bit (Professional Edition),
Microsoft Windows Vista® 32-bit and 64-bit (Home Premium Edition and Business Edition), or
Microsoft Windows 7 32-bit and 64-bit (Home Premium Edition and Professional Edition)
Microsoft Windows 8 32-bit and 64-bit (Home Premium Edition and Professional Edition)
you can find the same information in attached quick start guide.
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this answer is for you. if it helps, please click on the correct answer botton.
Best Regards,
ZhangJun