Please refer the below link, which explains you that how you can prevent that happening in future.
Also it will guide you to export preset from the older catalog and import in new catalog.
This approach did not work for me.
First you need to know where LR finds your presets. That could be in the Global location or with the Catalog.
Then you use the operating system (Finder) to simply copy and paste the Preset folders from old locations to new locations.
Read paragraph- "Your Presets & Templates" at Which Lightroom files do I need to back up? | The Lightroom Queen
You can use copy&paste to backup all your presets to a folder anywhere (eg. Dropbox) and restore at any time you upgrade.