Is there a 64 bit version of PTGui?
PTGui Pro for Windows is available as a native 64 bit application. The non-Pro version is 32 bits only, but runs fine on 64 bit Windows. A 64 bit Mac version is not available currently due to the fact that Apple has not ported all OS X libraries to 64 bit. PTGui has been optimized to create very large panoramas even on systems with little memory, therefore a 64 bit version is not required to create large panoramas. But it does run somewhat faster.