Will VMWare 7.1.1 be compatible with El Capitan?

[levmc]

Or Sierra?

 

[chrfr]

Or Sierra?

You might get it to work with El Capitan, but it's not supported.

Supported host operating systems for VMware Fusion and VMware Fusion Pro

kb.vmware.com

 

[levmc]

If it's not supported wouldn't that mean it would not work at all?

 

[chrfr]

If it's not supported wouldn't that mean it would not work at all?

Not necessarily.

 

[levmc]

Would that mean that it might work with Sierra as well as El Capitan?
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Would there be a way to find out for sure before I upgrade to El Capitan?

 

[TiggrToo]

Gamble. There may well be folk since been fine, others may well have failed.

Being virtualization it digs deep into the OS and hardware. It's all unsupported so only you can decide.