I hear you, mate. My engineering software and controlling cards work only on XP, and it is a constant struggle to keep the systems from suddenly deciding to “upgrade” to Win10, like it or no.
Forced “upgrades” are something I must constantly be on the lookout for, and it is an ongoing problem that I do not wish to have to be constantly dealing with.
Have you tried Draftsight? Release Feb2016 just came out and it supports Win10.