My version of 7zip is 7zip 19.00(X64) from 2019-02-21
NSIS version : 3.03
I can decompile with 7zip a DT installer made in 28/01/2019 available here: https://keybase.pub/gaaned92/DTW64NightlyBuilds/
So I suspect mainly the NSIS installer (or some new installer generation scripting in DT). I will try to build last dev 2.7 DT version