Chubby Bunny allowed me to easily set-up OS 9 and keep my Hypercard business software running on my OSX Macs.
Now with OS Mojave arriving and the implied threat to make life hard for 32 bit apps.. I am of course anxious to upgrade to 64 bit Sheepshaver.
I am not that computer literate... so .. is this an option and how hard to achieve.
I run my emulator on a recent Imac .. iMac (Retina 5K, 27-inch, 2017)

There is an easy way where you can use a newer version of SheepShaver with the Chubby Bunny files while leaving Chubby Bunny in place. After you start using the new SheepShaver application, you need then to be careful not to move, delete or start Chubby Bunny itself ever.

And there is a cleaner and better way to set up the new SheepShaver, preferably as self-contained virtual machine, using the HD image and ROM file that can be copied from the Chubby Bunny package.

I would advise the second option, although it is a little more complicated. I can guide you through the process.

Which option do you want to try?