The thing truly named “Plugin Manager” was last compatible with Notepad++ in v7.5.9 from October 2019. Had you really not updated since then?
Or are you talking about Plugins Admin? That’s the builtin replacement since v7.6 in November 2019
And it’s still in v8.9.1:
0e15144b-967e-42d8-a505-a19330607d00-image.png
My guess is that you deleted gup.exe and/or other of the content in the updater folder, or the plugin list DLL. To find out:
Exit Notepad++ Perform steps 1-3 for each of the following files List of files C:\Program Files\Notepad++\notepad++.exe C:\Program Files\Notepad++\plugins\Config\nppPluginList.dll C:\Program Files\Notepad++\updater\GUP.exe C:\Program Files\Notepad++\updater\libcurl.dll If any of those files are missing, you will need to reinstall, making sure to include the auto-updater and Plugins Admin, because all of those files are required for Plugins Admin to work Steps Right click on the file and choose Properties Look to see if it still has the Unblock checkbox If it does, checkmark it, then click Apply / OKhere is an example of a GUP.exe that still has the mark of the web:
9baed526-5a1a-4497-a75b-1acdc23f3b85-image.png
After making sure the Mark of the Web is gone from all those files, then restart Notepad++, and Plugins Admin should be there.