Cannot search out Extensions after update xwiki version to 10.11.10 or 11.10.1

SOS!!! Urgent!!!
I have updated my xwiki website, but after the updation I cannot search out Extensions, such as CKEditor.

So I decided to revert to my old version, but still cannot search for extensions.

Anyone can help?

Was not a problem on your side actually, looks like https://extensions.xwiki.org search index is in bad shape (i.e. it’s almost empty so you don’t find anything).

We are working on it and it should be fixed ASAP hopefully.

Thanks very much for such a quick response.
I tried to update xwiki from 8.5 to 10.11 yesterday, and the extensions can be searched out at that time. After the updates I installed the CKEditor Integration extension because we cannot open the Edit page normally. But then I found the Administration Application has changed and the Extension Manager was missing! I tried several times and still cannot find the Extension Manager.
What can I do for this case?
And is there any guid for updating the xwiki?