I purchased an Mac Upgrade version of Adobe Photoshop Elements 13 & Adobe Premiere Elements 13 three (3) days ago now, but I am still unable to download the update. I am currently using version 12 of these products. When I click on the Download link in my Order details screen, I receive error message "413 Header Length too Large".
This is not Adobe. Rather user to user. You need to contact Adobe to sort your order for Adobe Photoshop Elements 13 and Adobe Premiere Elements 13.
If you do not have the following contact links already, you can try to contact Adobe Chat orders by either of the two routes (they both may lead to the same place)
Click on the following link for Adobe Chat Orders
Membership, Account, Payment
Payments, Invoices, Orders
for return, cancel, or exchange
the means that you originally used for the order.