If a link cannot be loaded it means that it's:

Not archived on the Way Back Machine (literally does not exist)

OR

Theoldnet's code is failing to parse it due to a bug or absent functionality.

The best way to go about troubleshooting this is head on over to the Way Back Machine on a modern computer and try to load the site directly. If it fails to load then there is nothing that can be done. If it does load then that means there is a bug on TheOldNet.com. This should be reported using the bug submission form which does not exist yet. For now use Github Issues


An additional troubleshooting step, simply replacing http://theoldnet.com/get|search with http://theoldnet.com/raw will take your existing settings and turn that into a redirection the Way Back Machine.