I ran into this situation with my Minix NEO Z83-4 Mini PC where I am limited in internal hard drive space (32GB) and wanted to install (or move) apps to an external drive. With Windows 10, it is possible to do exactly that. The only apps that I could not move were the apps already baked into the OS.
To learn how to install (or move) apps to an external drive I encourage you to follow the instructions that are posted at How-To Geek (see source link below). If you need an external hard drive, click here to see the wide array of options available.
Windows 10 allows you to install apps from the Store on any drive you like. You can also move apps you’ve previously installed to a new location without uninstalling and reinstalling them.