If you do not have the 1.5.97 Creation Kit backed up, you must rely on community archives (often found on Nexus Mods or dedicated modding discords).
The official Creation Kit 1.5.97 suffers from several critical issues: skyrim se creation kit 1597 patched
The Skyrim SE Creation Kit 1.5.97 Patched is the gold standard for modders supporting the vast majority of the player base who have not updated to the full Anniversary Edition. While obtaining it requires a few extra steps compared to the vanilla Steam download, the stability it offers for mod development is unmatched for the classic Special Edition environment. If you do not have the 1
Here’s a proper technical write-up regarding "Skyrim SE Creation Kit 1.5.97 (Patched)" — intended for modding guides, readme files, or community forum posts. or community forum posts.