I could tell you how to install it but it wouldn't run since it would say that you do not have a current kickstart. Look around on the net to see if you can find a good soft kicker but you'll need to have a 3.1 kickstart file to do it. You can get a kickstart legally from Cloanto with their "Amiga Forever" product.
When I first got OS3.5 it wouldn't install on UAE (Amiga died about 6 months after it was released) and found about 3 ways to install 3.5 without using an installer. One of those three is extremely easy and works like a charm regardless of what version your kickstart says, but won't work unless your system boots up in 3.1 kickstart. Not only that but the kickstart must be able to survive a warm reset to the system. Have a look at the "Emergency-Start" directory... you'll need to modify some of the files and tweak a few things afterwords but it's about the same as a fresh install.
The most painless way by far though is to just bite the bullet and purchase the 3.1 kickstart and install it... it's not hard to do so in any of the Amiga systems.
:pint: