Hello,
91.199.212.52 is Sectigo Limited, and that makes sense because the digital signature used for EmEditor was issued from Sectigo. EmEditor v19.8.1 uses a new renewed digital signature since the previous digital signature was expired. I believe it is the OS (Windows) that connects to these sites for some security checks over the Internet, especially because the digital signature was updated. EmEditor does NOT send or receive any data over the Internet.