Not sure if this will help, but there are a few ideas.
1. Take pattern to a copy shop and have them increase size. (easiest way)
2. Put pattern on graft paper and enlarge by counting blocks and marking, then drawing around.
3. If you have a fax machine, increase the percentage and run through, then just tape the pieces together until it's the size you want (hope this makes sense :) ). This can be time consuming and a little frustrating
4. Take Parchment paper, draw the pattern on it, then take a 2" ruler and mark dots all around then join the dots.
Hopes this helps and isn't too confusing.