I want to practice at home and on the road, will my purchase of this app be able to be installed on both my home computer and tablet together?

FPV Freerider here on Itch includes Windows,Mac and Linux versions.

So if you have a Windows tablet you can install it on both your computer and tablet.

I guess you are referring to the Android version available on the Google Play Store though. That version is separate and needs to be purchased separately, fortunately it's pretty cheap.