<p>Do you have then synced to another device? Or to the cloud?</p><p>If the former, export the favourites on the other device first!</p><p>Check to see if the favourites folder is still there and the favourites are still shown: <strong>%UserProfile%AppDataLocalPackagesMicrosoft.MicrosoftEdge_8wekyb3d8bbweACMicrosoftEdgeUserDefaultFavorites</strong>. If they are, make a backup copy of the folder.</p><p>Check to see if the browser on the 1809 machine is still synced to the cloud. Try turning off sync and turning it back on.</p><p>If that doesn't work, try re-importing the favorites from the other device or the backup folder.</p>