Solution - Unable to start MeSince after version 1.2.1 be automatic updated (Windows7 users)
MeSince new version 1.2.1 for Windows users has already published on 13th of November, but MeSince Windows7 users are unable to start MeSince after version 1.2.1 be automatic updating.
Download MeSince Windows exe. from MeSince website: https://mesince.com
, and do the in-place upgrade then your issue will be solved.