While you cannot "download" the files to your hard drive, a V-Prep subscription provides 24/7 on-demand access to a massive library of high-fidelity training aids.
While there is no dedicated "offline download" app, the website is fully optimized for mobile browsers, allowing you to study in the crew room or hotel as long as Wi-Fi or data is available. V-Prep | A320 and Boeing 737 online pilot training
Detailed guides covering normal, abnormal, and emergency scenarios.