Another way to try running Box Of Stops without a Raspberry Pi is to boot a PC from a USB stick or thumb drive.
There is a version of the operating system for the Raspberry Pi that has been compiled for an x86 architecture - for a normal PC. This can downloaded as an ISO image which can be used to create a bootable install on a normal USB stick.
Please visit here for instructions on how to download the image and transfer it to the USB stick. Please note this will need to be a dedicated USB drive - the install will erase any data already on there.
Once you boot the PC from the USB stick, you will see the normal desktop for a Raspberry Pi. This includes everything Box Of Stops needs to run.
From there, the normal install instructions for Box Of Stops can be used.
Clearly a PC has no Gpio buttons, but otherwise this can be used as a full version of Box Of Stops.