Downloadet eDrawings for iPad for free some years ago, now i can't use it.

Hi there.

I've downloadet eDrawings for my iPad, back in 2012, and haven't been using it since (school), now i want to open my files in it, but it wont do anything.

Now i've been told that it cost's \\\$1.99 in appstore, and i want to buy it, but i cant cause its already registeret in my iCloud as "previously bought app", and i can only download it for free again.

How can i use this app again, or how can i be able to pay for it??

Sorry for my bad english.

Kristian =)

SolidworksEdrawings