After Installing Notepad++ plugin TextFX and restarting the following error came:
Unable to find libTidy.dll in the system path or C:\Program Files (x86)\Notepad++\plugins\Config\tidy\libTidy.dll
Htmltidy is unable to find libtidy.dll. This is due to the plugin not being included in 5.9.3 and up to at least 5.9.8. This can be fixed by downloading Notepad++ 5.9.0 zip and extract the plugins\Config\tidy file to your notepad++ path’s plugin\config sub folder.
Restart Notepad++ and the TextFX menu has loaded correctly and the plugin is working.