Installed v 1.7 to check it out, mega cool and love the layout and ease of use. Saw that there was a free 1.7.1 Premium upgrade available. Tried to update in WordPress. It appears that it may have taken (although still showed as 1.7 in Plugins) and a message appeared in the Dashboard with:
All-in-One Calendar Update
1.7.1 Premium now available. New in 1.7.1 Premium: WordPress 3.4 compatibilityClick to upgrade
The "click to upgrade" just went to an empty page on our site, so, no use there. I deleted the plugin and then got the 1.7.1 version at your website, installed. I still get the same message above, but now it's showing up as 1.7.1 in my Plugins.