I was able to hook some fork boots on in the past by jacking up the front of the engine & then loosen up the fork assemblies on the top and lower triple clamps while sliding the forks up through the triples and letting the jack down to lower the bike while sliding the forks up;that way you won't have to stretch the boots too far.Give it a try,it works.
I believe the fork boots will need quite a bit of stretching to slide them over the fork lower/slider;it's a challenge but do-able.

 

Try using silicone spray. You can get it at any auto parts, or even Walmart. It makes rubber super slippery.
TOOLS

 

+1 it's good for rubber parts and extends the life of rubber.

 

Thanks guys. I was able to get them on. I shoulda taken pictures, but the way I got them on was I cut strips from a milk jug and slipped them under the bots but over the fork legs, then was able to slide them on and pull out the strips. A heat gun helped also.

I was reluctant to use any kind of lube, whenever I try that method I wind up with everything slippery and can't manipulate anything.

 

ok Al, you're saying like the thin molded pieces of 1 gal. type milk jug plastic as a 'starter guide'type of thing? just to get the boots to move over the blunt edges of the lower fork slider ? ingenious How did it work? no tears on the boots ?

I wonder how a sheet of plastic or cellophane wrapped around would work ?

 

Yeah thanks Al for next time taking a pic of the process,I'd like to make it easier on myself next time also .