I don’t know why you cannot find ComparePlus in any tab of Plugins Admin with that setup.
However, you should be able to install it manually, even without Plugins Admin. I know you said you tried before, but please follow these exact steps anyway.
Close/Exit Notepad++ completely Go to https://github.com/pnedev/comparePlus/releases/latest , and download ComparePlus_1.0.0_x64.zip Create C:\Program Files\Notepad++\Plugins\ComparePlus\ Unzip ComparePlus.dll from the zipfile into that folder Unzip the libs\ folder from the zipfile into that same folder You should have the structure:f467454e-476f-4cb0-96f9-bd972387db2a-image.png Run Notepad++
At this point, you should have ComparePlus in the Plugins menu.
85f9cc21-8985-4213-9107-b0b9b8a66c01-image.png
If not, please share your updated Debug Info, and also a directory listing of your C:\Program Files\Notepad++\Plugins\ directory, as well as the contents of the C:\Program Files\Notepad++\Plugins\ComparePlus\ directory (… whether by screenshot or copy/pasting from a cmd.exe or powershell window)