I'm definitely using 17.6.6, and if for instance I put my laptop in airplane mode and start up the app, I still get the error.
I can't see much of it, since there's only around three lines of text in the window and it does seem to go on for a bit, but the first lines are:
Error: getaddrinfo ENOENT itch.io:433 at Object.exports._errnoException (util.js:949:11) at errnoException (dns.js:33:15)
I can try to copy-paste the rest of this, three lines at a time, though if there's a full log output somewhere on disk that might be easiest.