The last version of MC7 is 21.00.01 build 34. This info is at the bottom of the About screen.
I found a couple of MC7 specific videos most were older versions but all the synth should show up in the browser regardless of which version is used. Visually the only different I can think of between the 32bit and 64bit versions of Cakewalk DAWs is 32bit plug-ins show up with (32-bit) next to their name in plug-in lists and load inside BitBridge.
I would be surprised if Cakewalk made any videos in 32bit machines in some time. They switched to 64bit for primary development and testing years ago.
Consider upgrading to
Cakewalk by BandLab. It is a much more capable DAW using a similar interface based on a version of SONAR develop after MC7.
The upgrade is free and will load any project and plug-ins bundled with MC7 not found in CbB such as the Cakewalk Sound Center. There is
support from BandLab and the forum support is better too.