First, download the mod, and extract the rar file. It should contain the following folders:

00 - Main
01 - DLC
02 - GOTY ESP
03 - Patches
04 - Addons
05 - Prepacked
fomod

First, make up your mind if you want to install the ADD or the REPLACE version of the mod.
To remind you, the ADD version adds all the scopes without changing any vanilla scopes.
The REPLACE version replaces the Short and Medium Scopes with 4x and 8x Combat Scopes respectively.
Furthermore, the REPLACE version replaces the Short and Long Recon scopes with 4x and 8x Recon Combat Scopes.


ESP'S
First, we make sure the ESP's are in place.
There are 4 ESP's you can choose from:

1 - Main Vanilla Only ESP > Contains vanilla scopes
2 - Far Harbor ESP > Contains Far Harbor scopes
3 - Nuka World ESP > Contains Nuka World scopes
4 - Main GOTY ESP > A single ESP containing the vanilla, Far Harbor and Nuka World scopes

If you have both Far Harbor and Nuka World, and want a single ESP:
   - go to the '02 - GOTY ESP' folder
   - If you want the ADD version, copy the '3dscopes.esp' file in this folder to your Fallout 4 Data folder
   - If you want the REPLACE version, copy the '3dscopes-replacer.esp' file in this folder to your Fallout 4 Data folder
   - Thats it for the ESP's. Continue Reading at 'DATA FILES'
   
If you do not have both Far Harbor and Nuka World, or want separate ESP's for them:
   - go to the '00 - Main' folder
   - If you want the ADD version, copy the '3dscopes.esp' file in this folder to your Fallout 4 Data folder
   - If you want the REPLACE version, copy the '3dscopes-replacer.esp' file in this folder to your Fallout 4 Data folder
   - If you have any DLC, go to the '01 - DLC' folder
   - If you previously copied the '3dscopes.esp' file, and have Far Harbor installed, copy the '3dscopes-farharbor.esp' file to your Fallout 4 Data folder
   - If you previously copied the '3dscopes-replacer.esp' file, and have Far Harbor installed, copy the '3dscopes-replacer-farharbor.esp' file to your Fallout 4 Data folder
   - If you previously copied the '3dscopes.esp' file, and have Nuka World installed, copy the '3dscopes-nukaworld.esp' file to your Fallout 4 Data folder
   - If you previously copied the '3dscopes-replacer.esp' file, and have Nuka World installed, copy the '3dscopes-replacer-nukaworld.esp' file to your Fallout 4 Data folder
   - Thats it for the ESP's. Continnue Reading at 'DATA FILES'

DATA FILES
There are two options with regard to the data files.
There are two prepacked BA2 archive files, for those who do not want to deal with loose files, and then there are the loose files.
If you want to use the BA2 archives:
   - go to the '05 - Prepacked' folder.
   - Copy both files to your Fallout 4 Data folder.
   - If you installed the REPLACE version, rename the two files in the following way:
   '3dscopes - Main.BA2'         rename to      '3dscopes-replacer - Main.BA2'
   '3dscopes - Textures.BA2'     rename to      '3dscopes-replacer - Textures.BA2'
   - Thats it, you're done! If you want to install addons or patches, continue reading at 'ADDONS AND PATCHES'
   
If you want to use the loose files:
   - go to the '00 - Main' folder.
   - Copy the 5 folder in there (Interface, Materials, Meshes, Scripts and Textures' to your Fallout 4 Data folder.
   - If you previously installed ESP 2 or 4, go to the '01 - DLC\FarHarbor' folder and copy the contents to your Fallout 4 data folder.
   - If you previously installed ESP 3 or 4, go to the '01 - DLC\NukaWorld' folder and copy the contents to your Fallout 4 data folder.
   
ADDONS AND PATCHES
At the moment, the mod comes with 3 patches:

- G67 Combat Rifle Replacer
- Smaller Institute Weapons
- Take Cover

If you have any of these mods installed, do the following:
   - Go to the '03 - Patches' folder.
   - Open the folder named after the patch you want to install
   - Copy the contents of said folder to your Fallout 4 Data folder. NOTE: Only copy ONE esp file. Copy the 'replacer' file if you installed the REPLACER version. Copy the other one otherwise

For addons, do the following:
Below is a list of the addons available.
!!!ONLY INSTALL ADDONS FOR WEAPONS YOU ACTUALLY HAVE!!!
Pick the addons you want to install. If you picked all the addons belonging you a single pack, then you can copy the pack ESP instead of the individual ESP's.
Keep in mind that you should copy the proper version (replacer or normal).
If a certain mod does not have a replacer version, then use the normal version.
The names of the files in behind the name of the mod in between the parenthesis.
Also copy the scope models. These can be found in the '04 - Addons\Meshes\Scopes' folder, and should go to your Fallout 4 Data folder\Meshes\Scopes
NOTE: If you are installing the Prototype Gauss Rifle addon, make sure to copy the '04 - Addons\Meshes\CreationClub' folder to your Fallout 4 Data folder aswell (Data\Meshes\CreationClub)

PACK 1 (pack1)
   AK-2047 (ak2047)
   G67 (g67)
   M14 (m14)
   M2216 (m2216)
   R91M (r91m)

PACK 2 (pack2)
   Crossbow (crossbow)
   AS Vektor (vektor)
   HK UMP 45 (ump)
   LK-05 Carbine (lk05)
   USP.45 (usp)
   XM73 Gauss Rifle (xm73)

PACK 3 (pack3)
   M9 (m9)
   Spetnaz Rifle (spetnaz) -> Meshes folder is called ASVAL
   Bozar (bozar)
   Cryo Phaser (cryophaser)
   DKS-501 (classicsniper)
   DefenseGun (defensegun)

PACK 4 (pack4)
   Wattz Laser Gun (wattz)
   Ruger AC-556 (rac556)
   SVU (reconpack)
   Service Rifle (servicerifle)
   Bullpup Bozar (bullpupbozar)
   R91 Assault Rifle (r91ar)

CREATION CLUB PACK (ccpack)
   Prototype Gauss Rifle (ccgauss)
   Anti-Materiel Rifle (ccamr) -> Meshes folder is called AMR

PATCHES PACK (patchpack)
   Mosin Nagant (mosin)
   SVT 40 (svt40)
   Handmade AMR (hamr)