1Password won't open on iPhone

I purchased 1Password for iPhone ages ago, but haven't used it recently. Now I need it again, the app won't open up, it keeps crashing.
When I go into iTunes, it shows the price, rather than 'Downloaded'.
I see the App icon has changed and am guessing mine won't open because I've missed some of the upgrades?
Anyone know how I can update and use the app without paying twice for it and losing current data?
Ian

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