Hi 596004 ,
Thanks for highlighting the dead link.
For reference, the Just Invoices registration/install article was moved to the community forum and now lives at this post:
https://community.myob.com/t5/Other-MYOB-software/Installing-and-Registering-JustInvoices-on-a-new-machine/m-p/399912
I'm currently tracking down the original referenced application and the correct team to get the original link working. (So I'm aware, and acknowledge, that the link I've referred to doesn't work. I'll be updating this post/replying here when I've got this done.)