Vorlaagen verschwunden in Lightroom CC nach Update

Welcome to the Lightroom community. I'd love to help you with this, but I'll need more info.

What templates/presets are missing? Are these Book/Print templates or Develop module presets?

Did you upgrade an older catalog when Lightroom launched?

There could be a lot of possibilities in this case & ways to determine what happened.

• Lightroom presets & templates are of two types of files ending with two extensions. For example, presets.xmp & preset.lrtemplate. You can search for these file formats (.xmp & .lrtemplate) to list all the presets on your computer.
• Go to Lightroom > Edit > Preferences > Presets > check option to 'Store Presets with the catalog' is enabled or not.
  
  If enabled, you can go to the location where your catalog file was stored previously to find your presets.

Let us know how it goes.
Thanks!

Sameer K