Hi Brian,
The “forbidden” code wasn’t returned from our end… I located your download of the plugin in our logs, and it was normal (200 code – https://en.wikipedia.org/wiki/List_of_HTTP_status_codes):
213.251.189.208 – – [29/Jun/2014:19:44:24 -0400] “GET /plugin-info/?checking_for_updates=1&installed_version=1.6.2.9&udm_action=updateinfo&sid=(snip)&sn=(snip)&slug=updraftplus&[email protected]&p=amVzdXNkaw=&si=(snip) HTTP/1.1” 200 489 “-” “WordPress/3.4.1; https://www.weddalia.com/mx”
Thus, the “forbidden” message probably means that the file permissions on your WordPress installation are not right, and that there was a failure by WordPress to save the downloaded plugin zip to disk. Check the file permissions on these directories to make sure that they are read+writable by your webserver:
wp-content, wp-content/upgrade, wp-content/plugins, wp-content/plugins/updraftplus
Best wishes,
David