These instructions work for both the Deca 1 & the Deca A1.
When I first got the Deca 1 I didn't have a manual, so had to make up both the naming and the method for setting it up. However I then was sent a copy by the kites designer, Mark Ricketts from Guildworks, which had a slightly different setup, which I have added here as well.I have tried both and I have to say it's 50/50 which is the best - on my method you have to bend the main bow spar (CL-CR on the diagram), where as on the official method you end up having to bend the wing spars (AL-BL & AR-BR) more. On a windy flying field it doesn't make much difference. Try both then choose which is best for you.
Attach flying lines on the attachment points Top: EL & ER, Bottom: FL & FR