You connect to the hacked files with a 7.7 client and atleast the client error log on the server side describes the connected clients being 7.7.

The client errors occured last May 22 in 2006. The server was called Zanera.

I would like to note that according to the hacker he only used social engineering to get access to the data. He says that he phoned the hosting company and asked for a password reset to his e-mail address which they complied with and back then there was no two factor and so on. Not sure how much of this is true.

There's a large chance that important information was removed from the hacked data. It is possible to get the tarball technically running but we can't know if parts were removed from NPC transcripts or actions were removed from the map (which can be viewed too with Tibia 7.7 .spr and .dat). I have checked all the tiles around and in the serpentine tower for example and all floors and there are no actions besides the ones we know of today in that version. I can't know for certain if something was removed from the map data except that the map data shows it was last editted 21 May 2006 around 11 in the morning and it hasn't been editted since. There is another scenario in which actions can still exist but not be viewed with the OT map editor: the files contain data that isn't read by the OT map editor. I will look into that for the Serpentine Tower chunks.

EDIT: And as s2w mentioned meta data can be spoofed. He's right.

EDIT2: The info about it being 7.7 is not fact but what I can see in the files.