If you already own the game, you can still export its 25-song soundtrack into Rock Band 4 on PS4/PS5 or Xbox One/Series X|S for free. Essential Gameplay Context
The 25 songs included with the game were originally exportable to Rock Band 3 and 4 at no extra cost. If you owned the game and performed the export before the licenses expired, these tracks should appear in your "My Add-ons" section for newer games like Rock Band 4. Community and Unofficial Links
If you are searching for a download link for Rock Band Blitz , you have likely encountered a dead end. As of July 1, 2014, the standalone digital download of Rock Band Blitz was officially delisted from the PlayStation Store and Xbox Live Marketplace.
: Your Xbox 360 must be on dashboard version 17559 .