I did originally try ORE-1.8.3 however I had a different problem! I was getting many errors saying certain files could not be found and indeed when I looked at the files I could see that headers were referenced in procedure files which didn’t seem to exist. For example on Github, the file Engine/QuantExt/qle/math/trace.hpp exists but in the ORE-1.8.3 release zip file which I downloaded, this file (and others) didn’t exist. Not sure if I did something incorrectly? I’m not confident in building directly from the source code.