Error Installing Update

The Writer indicates an update is ready to be installed and each time I run it I get the following error msg.

Error while installing extension English spelling dictionaries, hyphenation rules, thesaurus, and grammar checker. The error message is: Insert duplicate implementation name org.libre office.comp.pyuno.Lightproof.en
The extension will not be installed.

I am running English version 4.3.5.2 My operating system is Windows 8.1

Thanks
Terry