Are you getting any error message while opening the catalog, please let us know that word by word.
Also, Open the Lightroom holding down Alt in windows and Opt in mac to Open the old or new catalog.
I am unable to open a catalog due to prematurely deleting a folder but recovered the folder from the recycle bin.Help please light room will not open the catalog
Please provide a lot more details. We don't know what folder you mean, or even what is happening when you try to open the catalog. Also please quote the complete exact unedited word-for-word error message.
Locate the catalog in its new location and double-click on it. Apparently you didn't restore the catalog to its original folder. If you can put the catalog in its original folder then the shortcut will work. Otherwise locate the catalog as explained.