The links to the tabs and tef files seem to be broken on the latest mandolin stuff.
I sent a message to Andy. I suspect they will get it back up soon. Thanks for reporting it.
So sorry for the inconvenience from the site! We are actually still working on this currently. I hope to have the site back to normal very soon! I’ll be happy to ask any questions you may have, feel free to email me at firstname.lastname@example.org.
Looks like the tabs are working again. Thanks Ben and Andy!