If you’re an existing Ext JS customer with a valid product license, you may download the latest version of Ext JS from this page.
Before you download, please note the following:
With a Standard or Premium support subscription, you receive one year of subscription rights that give you the right to obtain all major and minor version upgrades free of charge for 12 concurrent months.
If you do not have a valid support subscription for Ext JS 3.x, you are not entitled to Ext JS 4.0. You must purchase a new Ext JS 4.0 license to obtain rights to the software.
If you have a current Silver, Gold, Diamond, or Platinum support contract, you need to purchase a new Standard or Premium support subscription. Silver, Gold, Diamond, or Platinum support contracts do not include updates to the next major version. When these support contracts where purchased, they provided rights to all versions of Ext JS 3, but not the next major release, and in this case Ext JS 4.
If you purchased an Ext JS 4.0 license(s) without support you may purchase a support subscription within 90 days of the purchase of your Ext JS 4.0 license(s). If you purchase a support subscription after 90 days of the original license purchase, your support subscription will be backdated to the date of the Ext JS 4.0 license purchase.