I would recommend code-signing the build before distributing.
That's for Windows - for Mac you'll also need an Apple developer account, afaik they're the only people who can issue certs.
EDIT: Woah, I take that back. Digicert has now gone up from $74/year to $474/year, which is crazy. I now also need a new certificate provider...
https://en.sklep.certum.pl/data-safety/code-signing-certific...
We chose the "Open Source Code Signing" option, with it being stored on a physical keyfob thing (eg not "in the cloud"). Total cost, including the new key fob and super expensive, week+ delay, mandatory postage (!) was around 135 Euro.