VMware Fusion - Professional Version 8.5.10

I have a user that has High Sierra (don't ask why) just that he has it, and he is getting an error stating that parts of his VMWare are not 64-bit compatible. I expect he will need to upgrade to 11, which is almost a given, but here is my question. If there are instances inside his VM that are 32-Bit compliant only, are they talking about the apps inside his VM? Or are they talking about the VM itself? I ask this because I went onto the website to look up the information and it's rather sparse. I was hoping the big brains here would be able to help me clear this up a little. If the message is pertaining to the software inside the VM, I can get one of the techs here to pistolwhip him into submission by actually following protocol. Otherwise, I'll just tell him to use a VDI as he should be anyway.