When cloning, use git clone https://github.com/Pf2ools/pf2ools-app --recurse-submodules
The latest release can be found here. What files you should download depend on your operating system, with the following options:
.msi
installer or .exe
nsis installer (.msi is not recommended for Windows 7).app
Application Bundle or .dmg
Apple Disk Image.deb
Debian or .AppImage
Signatures for all the files can be found in the releases page.
The app includes an auto-update mechanism, so you should only need to download the installer once. Upon launching the app, it will check for and prompt you to install any available updates.