I have installed a new Windows10 VM (I did not try for Windows7 as it will end in less than 3 months).
It is a 64bits installation but I setup MSYS32 and MSYS64 on it.
To be sure it is working, I have generated http://www.b2ck.com/~ced/tryton-5.5.dev0.exe for testing. I will be glade to have feedback on it (just a 
is enough if it is working).
Also I did not setup a Python2 environment, this means no build for <5.0. I do not think it is a problem as they were any way in EOL according to the new release scheduling.