by Luis de Vasconcelos.
I upgraded Moodle:
$release = '2.0.4+ (Build: 20110907)';
to:
$release = '2.2.10 (Build: 20130513)';
using qeupgradehelper $plugin->version = 2011092500;
So I'm now trying to upgrade the 2.0.4+ quiz attempts to 2.2.10 using version 2011092500 of the qeupgradehelper.
Perhaps I need to go from 2.0.4+ to 2.1.10 to 2.2.10 instead...