@Carlos Detweiller That is the download I just tried, but it failed in my recently made VM of LTSB 2016.
You don't need MAS, use TSforge only: Code: TSforge /igpk 22badfe6-7d55-4485-874b-7ec317442134 TSforge /zcid 22badfe6-7d55-4485-874b-7ec317442134 Client-ESU-Year6 add-on for EnterpriseS,EnterpriseSN
They is what I ran, the ESU option (that failed) was in a sub list of the TSforge heading. What do you run those commands in?