Hello,
yes, please, follow the "manual upgrade" procedure then, as described in:
www.artio.net/faqs/artio-joomsef/licensi...oosing-existing-urls
The online upgrade will provide FREE version only in 2 cases:
1. no Download ID is entered in JoomSEF Registration AT THE MOMENT OF UPGRADE
2. the upgrade period has already expired
If you have free upgrades until 22 October 2010, then I am pretty sure you did not have the Download ID entered when you have upgraded.
Older version did not have warnings implemented, so maybe you did not notice. Since version 3.5.0 you will be warned if you should get free version instead of paid on online upgrade.