You can try to download them with SteamCMD.
To use SteamCMD, you can login with,
login (username)
Then set the download path with,
force_install_dir (path)
Then, you can install the game with this:
app_update (game's id) validate
You can find the game's id by opening the store page and copying the part with a number or by using SteamDB.
After downloading the app, you can copy the game's folder (to be referred to as downloaddir) to your steamapps/common/ folder and copy the .acf files steamcmd generated in downloaddir/steamapps to steamapps/.
You can see instructions to download it here.