Adobe: Illustrator Artwork 16.0 ((install))

Example: batch convert all .ai to .eps via Scripts → Other Scripts.

A .ai file from CS6 is a format:

When Adobe rolled out version 16.0, it introduced significant under-the-hood changes that improved how vectors were processed. If you save a file in this format, you are utilizing the engine introduced with CS6. adobe illustrator artwork 16.0

When sharing CS6 files with modern Illustrator users, ask them to “Save As → CS6” before sending back. Example: batch convert all