I've been running LTSB 1607 on an offline DAW for a few years now. Works great. But some apps I use are forcing me to update to 1809. The weird thing is, after I installed the 2016 version, I went online for 3 minutes and was able to activate it with a key I bought off Ebay. I still can't believe it worked. But MS accepted it. It's never been online since. Now I'm afraid if I update to LTSC 1809, I'll lose my hassle free, activated status.