The Internet Archive maintains a copy of the official distribution package from the original developer.
While Plugin Boutique now sells the "DYSPLACE Pro" version, their legacy support forums host the original 1.0.0 thread. You may need to register a free account, but the download link is often still active in a moderator-stickied post titled "DYSPLACE Original (Freeware) Archive." DYSPLACE 1.0.0 for Photoshop Plugin Free Download
: Remembers specific displacement settings for each layer, even when switching between different documents or reopening old projects. One-Click Editing The Internet Archive maintains a copy of the