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.
VMware Fusion 8.x is not supported on macOS 10.13.x High Sierra, he needs version 10.x or newer (no v9.x exists, because this release was called 8.5.x - and was a free upgrade).

You can have a look here: https://kb.vmware.com/s/article/2088571 

It could very well be that High Sierra became more strict about how an app should be built (no mix between 32-bit and 64-bit ??) - but still pure 32-bit would be okay, and of course pure 64-bit would also work. But it is only my guess.