SRX5308 VPN Client Lite license will not activate

I was wondering if anyone knows if you can still activate the Client Lite licenses. I know that I have used 3 of my 5 licenses, so my code is still valid for 2 more installs. I tried to use one today on a new laptop, and I am getting an error (activation error 70, try again later). If I click on the link to buy a license, it comes up error 404.

I understand that support ended in 2017, only a year after I bought this router new. If there is no support, is there an unlocked client available for download ? This is beyond frustrating that I would have to replace this router & reconfigure the connectivity on the existing working clients, after only 3 years of using this router.

Thanks for any input !