Auto LVL Difficulty mod.

You can check out this alternativer too: https://www.nexusmods.com/skyrim/mods/100001

Updated 24/10/2019:

v1.7:
Reworked 'more damage at higher levels' code.
Type: Set _AutoLVL_DamageFactorPerc  to x (to adjust damage).
Or set _AutoLVLDamagePerc but this is a global any level damage done by enemies multiplier. The mentioned above is meant to increase damage little at lower levels and much more at higher levels. Recommended to set that one instead. 
This version also doesn't apply any buff to enemies above your level.

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Updated 12/01/2019
Version 1.5, some mods had problems with this, so the buff was applied several times making enemies deal too much damage. Fixed. This version also doesn't apply any buff to enemies your level or above.

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Updated 25/09/2018 again. I get the itch to play skyrim every like 6 months or so, and i use this mod to up the difficulty to get things more interesting.

Added a video check it out.

Now enemies equal or above your level will get buffed (new in this version) but at a lower percentage. In early levels the buff is almost non existant, it increases as you level up. (I would like some feedback on how this goes in a playtrough). If this doesn't appeal to you then you can download 1.3 which is the same but without this change.

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Updated 25/09/2018
This mod was made when there was no legendary skills so it didn't caped the amount of health or damage increased to npc, making leveling up too much worse than better. The updated file now has a cap to how much damage and health creatures can gain.

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Updated, 11/07/13.

Recompiled to work with 1.9 patch.
This mod works fine with the latest versions of the game.

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What the mod does:
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This mod modifies creatures health, stamina and attack damage in the area the player is, using the player level as a base to calculate. It's done by a magic effect script.
The idea is to make enemies strong, the mod is most noticeable at high levels when the game becomes too easy.

 All creatures are affected by the mod, but Dragonborn creatures are not customizable (but still affected by default values).

You can use the file AutoLVLconfig.txt located in data folder of your skyrim to adjust how much health or damage creatures can do. Individual and global values.

Use:  Type:     bat "AutoLVLconfig.txt"     in the console after editing values.
Remember to do this the very first time the mod loads.

Or:

If enemies are doing too much damage set in console _AutoLVLDamagePerc to a lower number.
Example: Set  _AutoLVLDamagePerc to 1.0 or
Set  _AutoLVLDamagePerc to 0.8
I recommend leaving the above variable at 1.0 at first, and play with this one below instead:

Type: Set _AutoLVL_DamageFactorPerc  to x (to adjust damage).
This variable is meant to increase damage little at lower levels and much more at higher levels. Default: 2


To adjust the health gained globally use:

Set _AutoLVLPointsPerLevelPerc to x
Example:
Set _AutoLVLPointsPerLevelPerc to 1.1

Please view AutoLVLconfig.txt to know what settings you may change.


Be warned that the default _AutoLVLDamagePerc is set to 1.5 which it seems to be a little too much damage dealt by creatures. 1.0 or something like that should be a sweet spot.

This value is already set to 1.0 in AutoLVLconfig.txt i recommend running this file in skyrim after installing the mod (bat "AutoLVLconfig.txt").

Keep in mind that when changing numbers to increase or decrease difficulty, the values are not applied again to the same enemies the mod modified before, you need 'fresh' enemies.

To know the mod is working properly and to see values, you can use the console:
This mod affects creatures lower level than you, if a creature smithing value is 47, (this is what i used to flag them) then the mod modified it. To verify this you can open the console click on the creature and type:
Getav smithing 
Also a message 'AutoLVL' should display when loading a game.

If you type in console:    help autolvl      you should see several variables related to the mod.

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Creatures levels are not affected, the mod ´pseudo´ levels them modifying their values.

Install:
If using the older mod version, i think just overwiting the files is ok.

Issues:

in the rare event you happen to have trouble in the test fight to join the companions, disabling the mod during this part allows the quest to continue. The mod can be disabled in game by setting:
Set _AutoLVLEnable to 0         and enabled again:          Set _AutoLVLEnable to 1
Or i think this mod solves issues with modded 'magic effects' https://www.nexusmods.com/skyrim/mods/77465

Values modified:
Health
Stamina
Magicka
Attackdamagemult (how much damage enemies make).
Smithing - Used to flag the character as already 'buffed'.


Uninstall:
To avoid possible issues, please do not uninstall this mod mid playthrough, this mod is very very light, and can be disabled setting, Set _AutoLVLEnable to 0  making it run 2 lines of code every 3 seconds (which is nothing).

I hope you don't get confused with so much info to play you only need to use  bat "AutoLVLconfig.txt" on the console and thats it.

Thank you!

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Problems with other mods:
FIXED in 1.5, The only mod with problems with this that i played, is Maids 2 deception, which some characters reset the flag used and my mod applies the buff several times.

I would been nice to have added a MCM menu but too late i guess to learn how to program it.