Choose one of those links. If it doesn’t work, try another. If it’s not the correct one, it won’t install/load. (I’m not the most tech savvy, but the trial and error method seemed to work for me.)
The other replies tell you the simplest method, however if you decide you like Liftoff and want automatic update support, I would recommend Obtainium. To add the app to Obtainium:
Go to the Github Releases page for the app and put the url into “add app” in Obtainium.
How do you install it on android? I poked around github on my phone for a while and gave up.
If you go to this page (accessible from “Get on GitHub” in the main page) https://github.com/liftoff-app/liftoff/releases/tag/v0.9.12 there’s releases about halfway down, download the one that corresponds to your phone’s processor :)
The other replies tell you the simplest method, however if you decide you like Liftoff and want automatic update support, I would recommend Obtainium. To add the app to Obtainium: Go to the Github Releases page for the app and put the url into “add app” in Obtainium.