https://bugs.winehq.org/show_bug.cgi?id=43285
--- Comment #11 from Nikolay Sivov bunglehead@gmail.com --- It's described in details here https://wiki.winehq.org/Regression_Testing. Basically git vcs helps with that task, moving through commit history automatically, you only need to rebuild and test. If you can't build locally, you can use pre-built packages of specific version to find out what was the first version after 1.8 that stopped working. Regression test results are more valuable because you'll get exact commit that broke your application. Unless of course it was some change in your system and not Wine change.