This mod add original essential protections to the player character. When the player chacter goed down to bleed-out state you just need the use one, or more heal potion to stand up. (not be a regenration potion!) After when your character get up, the healt is restored back fully.
 
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Recommended to use no more health regeneration mods, but not requiment.

Requiment the fully new started game.

The midgame remove not be a  option. After the removal you need to start new game.

On AE version not tested. I dont know working, or not.

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Install:
1. Install with Nexus Mod Manager or move the .esp file in to the data folder. 
2. Activate ant move the plugin to the last position of the Load Order.
3. Start the fully new game to work!

Remove:
1. Uninstall with Nexus Mod Manager or delete the .esp file in the data folder.
2. You need to start new game after you removed the mod.

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When I uploaded the "Player Is Essential" mod in 2019, there were not many other working alternatives. I'm just a simple Skyrim player and I'm not a professional mod creator. So don't expect too much from this mod, but it works undoubtedly. Later "tonycubed2" nexus user created two mods that offer more opportunities for players: Death is Highly Overrated 2021, and the Death is Highly Overrated 2020. Find them, and do not install the "Player Is Essential" mod. :)