This information applies to version(s): 4
If you install Nik Collection by DxO over a previous version of Nik Collection by DxO, presets will be migrated automatically to Nik Collection by DxO. If you choose to use the Nik Collection by DxO uninstaller to uninstall a previous Nik Collection by DxO version, be sure to check the checkbox to keep custom and imported presets, or they will, unfortunately, be lost.
Please also see this article: