INSTALLATION (does not require new campaign):

1. Unzip the package.
2. Drag \Localization, \Config, \CookedPCConsole folders into your ...\XEW\XComGame game folder.
3. Confirm overwrites.
4. In DefaultMutatorLoader.ini add these lines:

arrStrategicMutators=ShivSlot.ShivSlotMutator
arrTacticalMutators=ShivSlot.ShivSlotMutator

Check DefaultModShivSlot.ini inside the \Config folder for some options.
You can also set everything in Mods Menu if you use my UI Mod Manager https://www.nexusmods.com/xcom/mods/766

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EW USERS only
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If you are missing DefaultMutatorLoader.ini file you need to make your game mutator-ready:

Perform steps 1-3 as above (make sure you are dealing with EW version), then:

4. Use PatcherGUI (from here https://www.nexusmods.com/xcom/mods/448) and apply XComMutatorEnabler.txt
Short manual to PatcherGUI if you never used it:
- there are 2 "Browse" buttons to the right (to set two paths as below)
- click upper "Browse" button and point path to your XCom-Enemy-Unknown\XEW folder. Default: C:\Program Files (x86)\Steam\SteamApps\common\XCom-Enemy-Unknown\XEW
- click another "Browse" and select .txt file, which you want to apply, that is XComMutatorEnabler.txt
- click "Apply"
You should also run (one time) PatcherGUI Tools->Disable phoning home and Tools->Disable hash check

5. Go to ..\XEW\XComGame\Config folder of your game (see the default path just a little above)
6. Create DefaultMutatorLoader.ini file (just create plain txt file and save it with the name DefaultMutatorLoader.ini)
7. Inside your brand new DefaultMutatorLoader.ini, at the very top add this line:

[XComMutator.XComMutatorLoader]

8. Under this section add below:
arrStrategicMutators=ShivSlot.ShivSlotMutator
arrTacticalMutators=ShivSlot.ShivSlotMutator

You want it look like this.

[XComMutator.XComMutatorLoader]
arrStrategicMutators=ShivSlot.ShivSlotMutator
arrTacticalMutators=ShivSlot.ShivSlotMutator