Rufus using iso mode worked for my zorin iso's... all 5 of them (Alpha, beta, core, core r1 and pro). The dd way didn't.
I would like to understand the Zorin's relationship with etcher, though i know it really isn't important. Depending on the number of pro users, i could see them signing an agreement for funding as long as they advertise them. That may be the reason, and the agreement most likely has a set expiration. So may be unable to recommend other utilities. Part of doing business, which i get and can't fault them for.
They visit the forum regularly, seeing the topics and reading up on things. If it continues this way i could see them attempting to either have etcher make it right or find another iso writer that will sign with them. The difficulty is finding one that's on two if not all three os versions (win, Mac & Linux).
Keep your thoughts coming because they are heard by the devs. The changes to this forum and the quick updates to include new kernels in the os are proof of that. You may not hear from them, but they constantly show that our collective voice matters.
. Relatively new usb drives, tried two, both less than 3 years old, used no more than 5 or 6 times.