SE Standard Library issue

We’re recently upgraded to 4.12.5 and everything went smooth … except, I receive this message every time I open the level

“This project requires he lowentryextendedstandardlibrary plug-in.
Would you like ot download it from the marketplace?”

I’ve confirmed that the LE Extended Standard Library was installed.
I’ve removed it from the engine
I’ve reinstalled it

The message keeps coming up. When I hit yet to download from the market place (even though it is installed) I receive “Whoops, we can’t find the page you requested.”

I can see no performance hit but it is a nuisance and I’d like it gone. Has anyone had this issue? Has anyone found a way to solve it or work around it permanently?

Thank in advance