WINE is a free open source compatibility layer installed on to your Mac that allows it to run some Windows applications under MacOS without requiring a copy of Microsoft Windows. There are numerous free and paid applications that incorporate WINE that are easier to install and setup. PlayOnMac
is one of these, others include CrossOver
PlayOnMac is free and relatively easy to setup to allow Rumen8 to run on your MacOS desktop. While the results are not pretty, Rumen8 runs almost as if it was native software.
If you are interested in trying PlayOnMac step by step instructions are shown below. This way of running Rumen8 is completely unsupported but may be the easiest and cheapest method to try first if you prefer an Apple laptop.