sorry for the distress! check out the bottom of the online FAQ http://www.sketchclub.com/help/#tabs-2
for details on linking the same account to multiple devices. currently you need a Facebook or Google account but if you don't have one of those you can also email firstname.lastname@example.org and i can help ya out manually. also the next udpate (1.13.1) makes this easier and automatic if you have iCloud.