I love Squirrels!

Get a gun?  I haven't found  any effective deterrent.  Did humanely trap one once but then you have to 'deal' with it as i believe, as they are classed as vermin, you are not permitted to release them elsewhere. Although who would find out is beyond me.

We were overrun with them one year so bought a humane trap. Didn't know about the "vermin" issue so, each time we caught one, we'd take it for a car ride to an isolated part of the woods and release it. We went 5 times one day! Still they kept appearing.
My OH was convinced that the little blighters were running back home before we us so he started spraying a blob of paint on their backs before release! We never saw any Blobbed ones again but we had to stop our trap and release when we were spotted letting one go and told we'd be reported if we came back!
So the pesky things are still here, planting acorns in all the wrong places.

Apropos eating them -  BBQd squirrel was on offer at a  Garden event i went to years ago. Not for me but a lot of people were tucking in!!