Autodata 3.38 was never released as freeware. It was a paid commercial product sold on physical DVDs or via enterprise licensing. Any website offering a direct download for free is hosting pirated software.
Instead of risking legacy pirated software, Autodata Group now offers official, cloud-based subscriptions that provide live updates for the latest vehicle models.
If you cannot find a legal copy, accept that the software is abandonware but still copyrighted. Do not risk your business’s cybersecurity for an old database.