"Invalid signature" error when using WHM's "Install cPAddons Site Software" module.

Symptoms

When using WHM’s “Install cPAddons Site Software” module we are seeing the following errors occur:

Signature verification failed for URL 'http://httpupdate.cpanel.net/cpanelsync/cpaddons/cPAddonsMD5/.cpanelsync.bz2'. Invalid signature. (/usr/local/cpanel/cpaddons/cPAddonsMD5/.cpanelsync.staged_bACBL9Qs) Please see https://go.cpanel.net/sigerrors for further information about this error.

Description

We've opened an internal case for our development team to investigate this further. For reference, the case number is CPANEL-49475. Follow this article to receive an email notification when a solution is published in the product. 

Workaround

Install WHMCS manually. Install WP Toolkit with one of our supported methods.