Download the latest release from Github:
- download the windows or linux version
- extract to a folder and run the executable
There is nothing to install.
The game is completely self contained within its folder.
Nothing is stored or changed outside that folder.
Download and extract the contents of the zip file.
In the extracted folder double click on 'pm.exe'.
If windows complains about an unrecognized app, click 'More info' then 'Run anyway'.
Download and extract the contents of the tar.gz file.
Open a terminal in the extracted folder and type './pm'.