Version is the specific "Anniversary Edition pre-update" version of Skyrim SE. It is widely considered the most stable version for modding because many complex mods (like SkyUI, boot menus, and complex overhauls) rely on SKSE64, which was built specifically for this executable.
To understand why a user would specifically seek a "1.5.97" patch, one must understand the dependency chain of advanced Skyrim modding. skyrim se unofficial patch 1597 download new
If you want, I can fetch the official 1.5.97 changelog and provide a verbatim list of fixes. Which would you prefer? and complex overhauls) rely on SKSE64
Would you like step-by-step installation instructions for USSEP from Nexus Mods (manager vs manual)? skyrim se unofficial patch 1597 download new