A solution.
Manually download the pack from the link in the logs.
Extract into your FTB\Unleashed directory.
You will now have 2 subdirs.
Go into the minecraft subdir and copy the version file up to the root of the unleashed subdir.
The contents of your \Unleashed subdir should now have instMods and minecraft subdirs and the version file.
Launch again and it will download the minecraft jar and other support files as usual and take its sweet assed time ( lol ) loading the reported 104 mods.
Good luck!
Sorry, have to add this.
I just spent a solid two minutes laughing my ass off.
I get greeted on login of this freshly minted mod pack with the news that "Damage Indicators Mod v.2.7.0.1 is out of date. v.2.8.5.3 is now available.
I just love this game.