Very pleased to say I went to grab a copy of the 175 bin file which was the one thatI had trouble with, and there was the 199 bin file (wasn't there before)which loaded perfectly (using StmCube) with the TinySA Ultra rebooting and happily making squiggly lines after!! So I guess mine is legit lol
Now just have to figure out the how and why again. Havn't touched an spectrum analyzer for 20 years.