Users and also we have found some issues with this release which issues are due to some changes in this latest release. E.g. the probing gives back 0 value always and we also found some syncronisation issues, so we removed this version from the downloads to avoid getting this version to many customers. So, we suspended the testing of this test release and will come out with a new release soon which will fix the issues we found.
The last stable version is 1.2047. It is 32 bit only. The new versions, which support 64 bit, also run on 32 bit systems. If your Windows is 32 bit, the program will run in 32 bit mode, and the same with 64 bit, so you'll be able to run UCCNC on 32 bit Windows.