Look at the support page. https://www.sencha.com/support/#platinum-maintenance

The forum link is just sencha.com/forum/. This yields a 404. It should be something like https://www.sencha.com/forum.

This issue is more apparent now that you've removed the forum link from the top level navigation. I would respectfully ask you to bring it back. It's been an indispensable source of knowledge since the beginning of Ext.

Please do at least fix the link so that new / prospective users aren't fooled into thinking it's gone completely.