To help you find exactly what you're looking for, could you clarify a few details?
Besides being a .zip , do you know if it contains textures, scripts, or documentation ?
Is this for a video game (like a mod or asset pack), industrial software , or a specific online community (like a forum or Discord)?
If you can provide any of those clues, I can dig deeper into more specific databases for you!
Do you remember where you first saw the term "deep post" (e.g., a social media thread , a dev log , or a technical manual )?