Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Lightning download for Thunderbird 52.9.1 corrupt and won't install

more options

I recently upgraded to Thunderbird 52.9.1. Upon re-start the Lightning Calendar was no longer present. I went through the usual AddOn process and attempted to download the latest version of Lightning, several times. Each time I received a message that the addon could not be installed because it appeared to be corrupt. How do I get a good version so I can get my calendar back?

I recently upgraded to Thunderbird 52.9.1. Upon re-start the Lightning Calendar was no longer present. I went through the usual AddOn process and attempted to download the latest version of Lightning, several times. Each time I received a message that the addon could not be installed because it appeared to be corrupt. How do I get a good version so I can get my calendar back?

All Replies (2)

more options

Valgt løsning

more options

Thanks for your help -- worked as advertised and easy to do.