I think the answer is your cruz is not a supported device - according to this website link. http://blogs.adobe.com/digitalpublishing/supported-devices
You might like to read this thread for a way forward http://forums.adobe.com/message/3364078#3364078
When might they support Cruz Tablets?
That's a bit like asking: How long is a piece of string?
I'm no expert, but in the short time of had my ereader (since Christmas! And it's not supported either by the way!) it seems to me that the supported list has grown. I might be wrong there, but it seems that way to me.