as said in the OP,sadly old saves doesn't work...
The OP message about old saves not working are for the 1.3 version, as in saves from 1.2 and older (chapter 1) will not work in the new standalone got out of prison and move forward story in Chapter 2.
I made a new game start when 1.3 came out, for chapter 2, the saves from that worked perfect in 1.4 and now those saves does not work in 1.5, hence my frustration and confusion.
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Edit note: Issue solved, it was a save from the re-done version of chapter 1 that I tried to play, which uses the same save folder so also places itself in chapter 2 and these two are not compatible..
I can't be the only one who stumbled unto this problem, so wonder if the Dev will make a separate save folder for each game in the future.