-Download SteamCMD for Windows:
-https://steamcdn-a.akamaihd.net/client/installer/steamcmd.zip
-Create a folder for SteamCMD, here: D:\steamcmd.
-Extract the contents of the ZIP file into the folder.
--On the first run, several folders and files will be created automatically.
-Run SteamDownloader.
-Insert the collection URL.
-SteamCMD will operate in the background and will be downloading items one by one (SteamCollectionDownloader must remain OPEN or downloading will be stopped!!.).
-You can track the download progress in: D:\steamcmd\steamapps\workshop\content\ {gameID}
Or after every batch (10 items) in SteamCollectionDownloader console
-If you want stop downloading items just stop SteamCollectionDownloader.
- If you are experiencing any issues with failed downloading,try delete : D:\steamcmd\steamapps\workshop/appworkshop_{gameID}.acf