Lightroom V11 update and catalog is missing

By default, Lightroom Classic opens the most current catalog at startup. This behavior can be changed to opening a different catalog or to always prompting you to choose a catalog.

Choose Edit > Preferences (Windows) or Lightroom Classic > Preferences (Mac OS).

In the General tab, choose one of the following from the When Starting Up Use This Catalog menu:

Load Most Recent Catalog

Opens the most recent catalog you've been working with.

Prompt Me When Starting Lightroom

Opens the Select Catalog dialog box at startup so you can choose.

A catalog in the default location

Lightroom Classic lists all of the catalogs in \Pictures\Lightroom (Windows) or /Pictures/Lightroom (Mac OS) for you to choose.

Other

Allows you to navigate to a specific catalog file (.lrcat) and select it as the default catalog to open at startup.

Would recommend that you select Prompt. Then you can choose what catalog upon starting LrC.

and see:

https://helpx.adobe.com/lightroom-classic/help/create-catalogs.html

V11-2 suggests that somehow your version 11 catalog was upgraded again. That isn't right, because version 11 is the latest version. Try to locate the V11 catalog and see if you can open that one.

Can you post a screen capture of the Library Module with the folder panel in view?

First thing is to use the "Update Folder Location" command which is a contextual menu in Library you can select from the root (or if necessary each) folder. Images back?