No access to Aperture after installing 10.10.4

[Ish]

I'm a bit stuck. I've just installed 10.10.4 and now there's no access to Aperture. The icon in the dock has been replaced with a white circle with a bar through it on a grey background. When I click on it I get a message saying Aperture isn't compatible with Yosemite. Odd as I've been using them together for a number of months now.

Has anyone had that problem and fixed it or have any ideas how to sort it? Help would be much appreciated!

 

[talmy]

Sounds like it wasn't the latest Aperture version for some reason, or it got corrupted somehow. Redownload from the App Store.

 

[Ish]

It does, doesn't it? I'll double check in the morning if I can find a way. Pretty sure I'd included all the updates though. It said download from the AppStore then the AppStore said it wasn't there I'll try again in the morning. I originally installed it from CD.