The Google file is locked behind a “request access” prompt.
As for the issue itself, be sure that global injection is not active in SKIF. Older versions of SKIF set up injection through background processes, which left the injection enabled even when SKIF was closed.
Special K doesn’t modify anything permanently or reach beyond a single game (the way it’s being used here). So I can only comment on this single game, and any crashing you are experiencing in other games is unrelated.
But the combination of RTSS and Steam Overlay looks like it’s causing problems here.