I converted this for my own personal use, figured I'd throw it up here especially as the original mod's permissions page asks people to please upload any modifications made. It is just the latest update of J3X and Rizing's Automatic Crossbows mod here: http://www.nexusmods.com/skyrim/mods/26329/?

J3X and Rizing have graciously given permission on the original mod page for others to use their work as long as credit is given. The scripts are J3X's and the models are Rizing's! I literally have done nothing except update the .nifs to the new format with the tool that was uploaded to the Nexus a few days ago. Mod is provided AS IS as I have pretty much 0 modding experience and won't be able to fix anything. It does work just fine on my own install with 110 other mods running though, so you should be okay.

The rest of the description is copied from the original mod's main page:

Automatic Crossbows 0.2.1
by J3X & Rizing

!!! DAWNGUARD REQUIRED !!!
!!! WORKS WITHOUT SKSE !!!

Please note that I can't create new models so don't request any. If you want Van Hellsing's crossbow then create the models for it yourself.

STORY:
The Thalmor have found some old Dwemer schematics and are rebuilding the Dwemers most fearsome weapons - automatic crossbows!
Scouts have found that they have converted Reachwind Eyrie, a Dwemer tower southeast of Markarth and northeast of Dushnikh Yal, into a research outpost. Can you stop them before it's too late?


CONTENT:
This mod adds 3 automatic Dwemer crossbows to the game;

• Dwemer Cheiroballistra, a heavy semi automatic crossbow.
• Dwemer Polybolos, a light burst firing automatic crossbow. Hold down your mouse when you are firing this weapon otherwise you will reload it.
• Automatic Dwemer Crossbow, a fully automatic crossbow.
  

You can find them and some schematics for them (apart from the Automatic Dwemer one, Dwarven Smithing perk needed) at Reachwind Eyrie. All crossbows can be used by any NPC.
This mod is also intented as a modder resource, feel free to use the included scripts to create your own automatic weapons!
I hope that you find the crossbows balanced, otherwise please let me know.

VIDEOS
Version 0.2:

https://youtu.be/oi_x6dkXJDo
https://youtu.be/0WUEtYtZPKo

Version 0.1:

https://youtu.be/HxtN0xVJZvQ

OTHER MODS USING THE CROSSBOW SCRIPT
ModernFirearms Mod - http://modtype.doorblog.jp/archives/30282266.html / http://bbs.3dmgame.com/thread-3901481-1-1.html
Dwarven rifle Crossbow tipe by mahty - http://skyrim.nexusmods.com/mods/22545
Assault Rifle and Sub-MachineGun Revolution by KCE - Loshirai14 - http://skyrim.nexusmods.com/mods/26605
Russian Translation - http://www.modmaximus.net/load/5-1-0-1452
Ancient Technology Extended - Automatic Crossbows by SteelChi - http://skyrim.nexusmods.com/mods/28362/
Automatic Crossbow Collection by kar2nz - http://skyrim.nexusmods.com/mods/36766
Send me a link to your mod and I'll add it!

INSTALLING

• Install as any ordinary mod, dump all files inside skyrim/data & activate j3x-autocrossbows.esp.
  

Will not work with Skyrim lesser than 1.8.



HOW TO CREATE YOUR OWN AUTOMATIC CROSSBOWS

• Load up your mod as the active file (or create a new one) and j3x-autocrossbows.esp
• Create copies of J3XCrossbowAutoSpell and J3XCrossbowAutoEffect, let's call them (1) and (2)
• Make sure (1) is refering to (2) as it's effect.
• Attach J3XCrossbowAutoScript to a crossbow of your choise, set the crossbowSpell property to (1).
• Depending on the type of firing mechanics you want, change the script attached to (2) to another one.
• Edit the properties of the script attached to (2) so it matches the desired clip size and firing speed.
• Done! - Save and try it out!
  

RELEASE LOG
0.1:
- Public release
0.2:
- Added Dwemer Cheiroballistra
- Added Dwemer Polybolos
- Added Bolt magazine
- Rebalanced Damage
- Added Thalmor at Reachwind Eyrie
- Removed spell message
0.2.1:
- Fixed quickshot perk.

KNOWN BUGS

• Only the last arrow carries the enchantment if the crossbow has any.
• Quickshot seems to sometimes cause bugs.
  

CREDITS
Credits to J3X for creating the scripts and general Creation Kit work.
Drop me a message at jex_ mus [at] hotmail [dot] com if you want anything.
Or contact me at SkyrimNexus as J3X.

Credits to Rizing for his awesome crossbow models!

PERMISSION

CROSSBOW SCRIPTS:
Clone, copy, spread, mutate, merge, and do whatever you want just as long you give me credit for my work.
You do not need to ask for permission to use any parts of this mod.
If you create a modification to this mod please release it.
If you manage to fix some bug or add a new awesome feature please let it be included in this mod as well.

CROSSBOW MODELS:
Feel free to do whatever you want as long as you give Rizing credit for his awesome work.


Other projects
I am currently working on some own games, if you enjoy my mods please check them out! For more projects check out my Personal website.