I upgraded the OS on my iMac with Yosemite and now I cannot open iPhoto. I tried to upgrade my iPhoto (recommended) and was told that that upgrade was not available in the US??!! What should I do? What have others done?

If you don't want to use Photos for some reason, click here and try following the instructions.

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Welcome to Apple Support Communities

With the OS X 10.10.3 release, Apple replaced iPhoto with Photos, an app included in OS X. Anyway, OS X Yosemite still supports recent iPhoto versions, so it looks like you were running an old iPhoto version that you cannot open anymore.

Unfortunately, Apple does not provide any iPhoto update through the Mac App Store, so you need to upgrade to Photos. To do so, just open Photos from the Dock and follow the steps. See -> Get started with Photos for OS X - Apple Support

If you were running a very old iPhoto version, you may need to run the iPhoto Library Upgrader first.

If you want to stay with iPhoto, follow the steps that Niel provides.

kathleenfromscotia wrote:

Will my photos from iPhoto be transferred into Photos? I am so afraid of losing my pictures, almost 4,000 of them.

All of them. Anyway, if the Photos upgrade goes wrong, you will still keep your old iPhoto library, so you can carry on using iPhoto with the steps that Niel provided.

You are welcome