The custom code for which version to run, sse or non-sse, seem incorrect.
Based on the discussion here: https://github.com/Feodor2/Mypal68/issues/164
and the release note of v68.13.8b (https://github.com/Feodor2/Mypal68/releases?page=2)
SSE means computer older than Pentiom4 (Pentiom3 or AthlonXP).
It look like sse version is for pc only has sse1 and the version without the word sse is for newer pc that has atleast sse2.