No support, and restore purchases crashes

I like this program on my iPad. It work well for browsing cruising areas, and looking at the tides. It’s definately not a full blown navigation software. The issue I have with this version is I am unable to restore my previous purchase of 2015 US Charts. It will download about 80% of it before it crashes and gives me a store error. I would love to give this a better rating, but, I have never gotten a response from the developer after two emails.

steeliesam about Charts & Tides, v1.3.15159