Hi!
I've successfully used this thread to fix an issue with MecSoft's VisualCAM for Solidworks 2014. I had a similar problem to that at the top of this thread; my hardware key (a sentinel SuperPro) stopped working when the newest Windows 10 update was installed (Build 1803). I would get an error when launching SolidWorks 2017 was trying to load the add-in from MecSoft, that the dongle was not connected; this would cause the add-in to load in demo mode, and I couldn't export anything from the add-in. MecSoft told me that my software is out of support status, and suggested I buy their newest version (for $2500!!).
Thanks to this thread, I noticed that my issue is similar to what others have experienced after this Windows update, and that VisualCAM also uses the sx32w.dll library. I downloaded the libraries linked above by GauravBhanot, extracted them, and replaced the sx32w.dll inside the VisualCAM folder within the C:\Program Files with the one from the download. Everything works now, without paying $2500! Thank you! I hope others can use this info to solve this problem as they update their machines, as well!
Oliver