If you are newly missing content and you are running Windows, you might try navigating to your Runtime folder using Windows Explorer. Right click the folder and select Properties. Click the Previous Versions tab. Double click any date before the update and scroll though to locate the missing files. You can copy them from the previous folder and paste them as you like.

I recommend making backups of your runtime folders and preferences files. A copy of your Preferred State file comes in handy too, along with dots files if you use them.

Best of luck and happy posing, Rªnce

Sorry, edited for clarity