I keep a local copy of installables for all software for which I have a license. That archive gets backed up to an offline disk just in case. Maybe this moment in history would be a good time for others to start doing the same. I've treated the My Account / My Software service as a nice but unnecessary luxury.
Does the above apply to being able to download Sony Vegas Pro 13 last build as well? Just asking as the OP (and maybe some other users) still seem to want to stay with that version for various reasons.