Which Cortona3D installer to choose — x32 or x64?

 

It is recommended to use 64–bit version of any Cortona3D tool on the x64–based operating systems. 64–bit versions support larger geometry by utilizing more RAM available.

64bit installer includes both 32 and 64bit versions of the product. 

 The version of your Operating System can be checked by right–clicking the Computer icon and selecting Properties. "System Type" indicates version of the OS (see screenshot below).