how do I uninstall latest updates for OS X Yosemite which incorporates photo

How do I uninstall the latest updates OS X Yosemite which has photo on it, I want my iPhoto back now, get your act together Apple

You can simply continue to use iPhoto and ignore the new Photos. iPhoto version 9.6.1 is working well in Yosemite.

Is iPhoto no longer in your Applications folder? The update to to MacOS X 10.10.3 just removed the iPhoto icon from the Dock, but let it installed. Simply drag the iPhoto icon from the applications folder back to the Dock.

Only, you need iPhoto version 9.6.1. If you have an older version of iPhoto it will show as crossed out.

See the following link, how to update, if you did not yet update to iPhoto 9.6.1:

Get iPhoto 9.6.1 if you didn't update before OS... | Apple Support Communities

The main idea is to move the iPhoto app to the Trash, so Spotlight does not see it as installed, reload the AppStore, and then to try to download again from the App Store - from your Purchases tab, not from the main page, since you can neither buy iPhoto nor update it, but you can reinstall, if your AppleID is associated with it.

You may need to unhide your Purchases, if you do not see iPhoto on the Purchases page when you sign into the AppStore with your AppleID:

See this link: Hide and unhide purchases in the Mac App Store - Apple Support

When you first launch iphoto you may see a warning, ignore it, see: If Photos won't open a library that you already migrated - Apple Support