I've looked at the forum of alphauserpoints. It seems that the importsystem of plugins has changed.
www.alphaplug.com/index.php/forum/42-alphauserpoints-19x-and-20x/26089-202-cant-import-new-rules.html?limit=6&start=6
In the last reaction it says that only the second way of implementation is possible. That is by autodetection. (see manual page 9):
Second method with auto-detect xml file at the ro
ot of frontend component:
Click on the button “Auto-detect plugins” in the co
ntrol panel of AlphaUserPoints after
installation of third component, plugin or module.
Check regularly or periodically by clicking on this button.
Problem: Alphauserpoint doesn't autodetect the ariquiz-plugin.