Hi Jesse, I have a version control system, and rolled back to previous version from my internal development tool. I couldn’t find any download link on Gravity Forms website for a particular requested version. They always release the latest one on the download button in the My Account profile if you look at the hyperlink, the downloadable file is stored at AmazonAWS S3 with access token only.
You might want to contact support team and ask them for version 2.5.7. I can’t publish a download link of licensed product.