How to uninstall iPhoto 9.5.1 and reinstall 9.5 from Time Machine?

Hi.

I would like to uninstall iPhoto 9.5.1 because the slideshow is not working, and the get-around suggested in this forum doesn't work for me - even if I access the slideshow through 'share', still it doesn't always run, and the settings are not functioning correctly at all. I cannot access the transitions mode part of the menu - it is completely unresponsive to the cursor. And the theme music keeps on playing even when I keep on unchecking the box (in some albums I tried to view, I eventually stopped this by selecting iTunes - it then went silent, which suited me fine). These two faults are fairly consistent, but there are also other odd and inconsistent things happening when I try to fix the settings or run the slideshow.

My albums are ordered by hand - I believe iPhoto might cooperate if the pics were ordered by date or camera file number but I find iPhoto's obsession with date and/or digital file number-led organisation extremely exasperating. Keyword/titles or numbering all the photos in each album also would not work because of the way I want the main photo gallery to be organised, and because some of these photos appear in several albums.

As slideshow is the most important aspect of iPhoto for me, I need to go back to an earlier version until/unless this bug gets fixed. I am using a brand new Retina MBP, so I assume it must have shipped with version 9.5, although I never even used this before downloading the update so I don't know if it would have functioned correctly. I ran Time Machine a couple of days before I installed iPhoto 9.5.1 so I do have 9.5, but I don't know how to get it back. Please give simple instructions. Thanks.

(I had to do this iPhoto download more than once because, as has happened with some other people on the forum, I find my link to the App Store is not functioning correctly - it required me to download some updates three times, and others it apparently somehow downloaded all by itself three times, yet the apps on the Mac still did not show the updated versions. Eventually, it seems to have sorted itself out, but not without wasting a lot of my time and effort in trying to understand what was going on.)