install application after update hp prime

[giubin]

Hi guys, someone can help me to understand how to install some app that i'd found on internet, where there's only the .hpprgm file. for ex. https://www.hpcalc.org/details/8794

I'd installed other app, with proper folder and all works. But only with this file, I don't know.
I'm new on hp prime (and italian, sorry for my english). Thanks.