Version 1.5.97 is often called the "Last Great Version" because:
version 1.5.97 is a popular stable choice for modding, often referred to as the "pre-Anniversary Edition" standard creation kit skyrim se 1.5.97
You can obtain a compatible version by either downloading specific older files through the Steam Console or using a downgrade patcher. Steam Community Steam Console Method Open the Windows "Run" dialog ( ) and enter steam://open/console To download the necessary files for version Version 1
To prevent crashes and enable necessary features, you must apply several community fixes. Creation Kit Installation for SE & AE creation kit skyrim se 1.5.97