There are two way to download the latest version:
The installer will try to install the app into your game folder automatically,
and also add a firewall exception that is needed in order for the app to function.
This is the easiest installation option.
2: Zip File
This is a zip file containing the mod.
You will need to install this yourself either using Content Manager,
or by manually extracting the files to your Assetto Corsa game folder.
You will also need allow the exe in the app to have access to the internet:
[Assetto Corsa Game Folder]\apps\python\SetupsAndTimes\app\SetupsAndTimes.exe
The default location of Assetto Corsa on windows is:
Windows 64-bit: C:\Program Files (x86)\Steam\steamapps\common\assettocorsa
Windows 32-bit: C:\Program Files)\Steam\steamapps\common\assettocorsa
After installation you need to activate the mod.
You can do this in Assetto Corsa:
Or in Content Manager: