Synth now comes in a 32 bit and a 64 bit version. Full install is required.
A full list of changes can be found here: http://karmafx.net/?id=2
Registered users will receive their download links by email ASAP. Until then, the previous RC1 download link will work just as well.
"Check for Update Now..." inside the synth will only work if you have version <=1.16, and want the 32 bit update.
On Mac, currently only one version (32 or 64 bit Audio Unit) can be installed at a time. The demo version, downloadable from the product page, is now also available in both 32 and 64 bit.