You can find the original Skyrim Edition of this mod from here.

I ported this mod because I like mods that adds immersion to Skyrim. Also the author allows anyone to port and publish it because he doesn't have an opportunity to run SSE. I gave the same version number (version 1.7 when I first ported) as the original mod to avoid confusion and for any inconsistencies.

What's New
Version 1.7.2

• Performance improvements
• Spell list management is rewritten from scratch
• Spell count limit (128 before) removed
• Added better spell list management. You can view and manage all the spells in your study list. Also navigating through pages, changing selected spell or moving spells do not force page refresh. It means it is faster and easy to manage with your keyboard or mouse.
• Added insta-learn command
• enable/disable "Spell book removed" and "spell notes added" notifications configuration
• Old obsolete code clean-up
• New images added to mods page for 1.7.2
  

Upgrading to version 1.7.2

• Make sure you have a manual save before updating this mod
• When you start a new game or load an existing save it automatically upgrades the mod. You should see a notification like "[Spell Learning] Installed version 1.7.2"
• Check your spell list from mods configuration menu and make sure everything is there and working
• I tested the mod with new game and existing saves. There is no known bug or something to warn at the moment. If you experience a bug please post it in detail. 
• Enjoy the game
  

The description below is provided by the original author (auie4545) of this mod.

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Skyrim Spell Learning and Discovery Mod

Summary

This is a gameplay mod for Skyrim Legendary Edition. It adds realism and configurability to spell learning for the player.

Gameplay diff

Before this mod (Vanilla Skyrim)

• Merchants are the only source for spells
• Opening a spell book grants spell knowledge immediately
  

Issues

• But lore tells us learning magic should require effort
• Insta-learning breaks our suspension of disbelief
• What about self-development, research and magic discovery the lore tells us about?
• When trying to fix Skyrim's economy with "cutthroat merchants", spells may become overly expensive. But buying is the only option.
  

After this mod

• Player is prevented form insta-learning from spell books. When buying a book from a merchant or otherwise picking up any spellbook, "Spell learning notes" will be added to the player's inventory instead. (configurable)
• Corresponding spells are added to his/her todo list, which he/she studies every night before going to sleep. (no in-game representation, just pretend or use the "simple actions" mod)
• There's a dice roll after each rest (once a day) to check if a new spell has been learned from the books. (configurable difficulty)
• Learn by practice: The more often the player casts spells, the more chances he/she has to successfully learn new spells
• Mages are researchers: There's also a chance to discover a spell by oneself without having acquired its book. (configurable difficulty, can be set to 0% chance)
• Roleplaying a mage also increases chances of spell learning. (configurable)
•   ** By hoarding a personal library of "Spell learning notes" (stackable in inventory)
•   ** Discussing "magic theory" with mage NPCs
•   ** Staying in inspiring locations (Winterhold college, temples, your own study)
•   ** Consuming mind-enhancing concoctions, with mild or dangerous side effects
•   ** Learning from daedra spirits through a midnight ritual
  

More and higher-end spell books can be found on opponent casters' corpses, symbolizing their own ongoing study of the arcane arts.

This enables to be more involved with mage roleplay (various flavours), gives incentive to sleep, enables self-reliance (grow your mastery of the arts by adventuring). Depending on the configuration options chosen, it can add a large difficulty to the base game, or on the contrary be easy/cheaty. The default options aim to add a bit of realism without being a chore.

Requirements

Mod requires SKSE, FISS and the Dragonborn extension.
(FISS is not a hard requirement, it's only used to backup and restore your study list)

I also suggest using a mod allowing to sleep in temples ("Simple Actions", "You can sleep", etc.) and another to remove the player's starting spells ("Skyrim Unbound", "No starting spells", etc.).

Installation, uninstallation

Installing should be correctly handled by your mod manager of choice.
Uninstalling : First disable the mod in its MCM, save your game. Remove the mod using your mod manager. Launch your game again and make a clean save. Finally use a savegame cleaner to remove the last bits of scripts from your savegame.

Scripts & performance

This mod uses Papyrus scripts. The scripts are event-based, triggering on casting animations, sleep and object pickup events.
They should not pose a stability or performance problem at all in normal use. The only case I can think of an issue is if you pick up ("Take all") dozens of spell books from a container or corpse all at once. Expect a stutter if you ever do that. Pick things up one by one to avoid this potential problem.

Compatibility

Spell learning feature: Compatible with any spell book from any mod, no patch required.
Spell discovery: Uses merchants leveled book lists, so spell mod has to add its content there to be compatible. Most spell mods do that, but for example Forgotten Magic doesn't IIRC.

Incompatible with Better Spell Learning.

A player reported: "A little wonky when used with SPERG. I ended up with two versions of all bound spells [...] had to remove the wrong ones with the console". Some scripted mods like this one might cleverly swap your spells behind the scenes, my mod won't handle that. But it's only an annoyance, you can remove the unwanted spells with the console, Grimy Utilities or any mod to forget spells.

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Credits

Major credits and thanks to the original author auie4545.

Credits from the original author

Major credits to legendary mod author kassent who accepted to let me use his bookextension.dll from "Fast Operation System" in my mod.

Credits and thanks to Sjogga, /u/fadingsignal, EnaiSiaion, alex9ndre, and countless others I learned Papyrus from by dissecting their scripts and ESPs.

Additional Information

• Original mod uses FISS for import and export. I tested this SSE version with FileAccess Interface for Skyrim SE Scripts - FISSES by TerenceYao. Although it is a complete rewrite of the original FISS mod my tests show that it is working with this mod without a problem.
• I installed and tested this mod mid-game and it worked flawlessly. 
• This is a script based mod. It uses events for perfomance and so far it is very stable. I will continue testing and try to fix bugs if any exists.