Ensure the folder name in the plugins directory exactly matches the name of the .dll file. For example, if you have ComparePlus.dll , it must be inside a folder named ComparePlus .
Close and relaunch Notepad++. You should now see "Compare" or "ComparePlus" listed under the menu. Alternative: The "Online-to-Offline" Method notepad++ compare plugin offline download
Create a new folder named exactly (for the latest version) or ComparePlugin (for legacy versions). Ensure the folder name in the plugins directory
To perform an offline installation, you must first download the plugin's .zip package from a machine with internet access. Ensure you download the version that matches your Notepad++ architecture (x64 for 64-bit or x86 for 32-bit). You should now see "Compare" or "ComparePlus" listed
Available on the official GitHub repository . This is recommended for Notepad++ version 8.4.2 and newer.
Note: The folder name must match the name of the main .dll file without the extension. Extract the contents of the downloaded .zip file.
Available on the Compare Plugin GitHub releases page or SourceForge . These versions are better suited for older Notepad++ installations. How to Install the Compare Plugin Manually (Offline)