Is there a 64bit-Version for iPhoto? After the latest update the access to iPhoto ist blocked.

No, use Fotos, aka Photos App.

How to Migrate Pictures from iPhoto or Aperture to Photos for OS X - MacRumors

Mingie schrieb:

I have albums and Diashows in IPhoto. Can I get to them via Fotos?

When you migrate from iPhoto to Photos, the albums will be preserved, but not all smart albums.

And the slideshows will be migrated as simple albums. You will have to recreate them. Photos uses different themes and templates, so the slideshows are not compatible.

This support document explains, how the new Photos Library will show you the iPhoto items:

How Photos handles content and metadata from iPhoto and Aperture - Apple Support