FYI ... the limitation is an IRS restriction not a TT situation.
No ... buying a second disk will not get you more efiles. The Business program used to have unlimited efiles but it seems they are limiting them to 5 this year. Once you have reached your limit the rest must be mailed in.
So when you help someone else prepare their return does TT somehow know their return is linked to me?
If the other person loads and registers their own copy of TT and I give them their TT file, they will still not be able to efile?
If they install their own program on their computer you can give them the file ending in .tax2022 and they can efile it. The efiles are only linked and counted on the same computer. So yes they should be able to efile it.