I'm not able to help you with the v2.2 reinstall, but here is some potentially useful info.....

Riffworks Line 6 Edition is an outdated product. The most recent commercial versions of Riffworks are now compatible off-the-shelf with Line 6 products  - no further need for a special Line 6 Edition. The two current versions are Riffworks T4 (free, and similar to the previous Line 6 Edition but with the ability to save files, unlike the demo mode) and Riffworks Standard, a more fully featured product that must be purchased, but can be pourchased at a deep discount for Line 6 Edition owners.

All necessary info for you can be found on the Sonoma Wireworks website:

http://www.sonomawireworks.com/T4/

http://www.sonomawireworks.com/store/index.php?main_page=product_info&products_id=10

http://www.sonomawireworks.com/guide/index.php/Riffworks_Crossgrade