Meteor Client does not officially support Minecraft version 1.8.9. Because it is built exclusively for modern Fabric versions, there is no "verified" native download for 1.8.9 from the official developers.
Next, considering that the user might need an academic paper, a report, or a documentation paper on verifying the download of Meteor version 1.8.9. Since Meteor is an open-source project, their official repositories would have the source code and download information. Verification processes usually involve checksums, digital signatures, or hashes that can confirm the integrity of a downloaded file. So the paper should address how to verify such downloads, using Meteor as an example. meteor client 189 download verified
Verify GPG Signature