Installation
Extract the folder in the archive to the Data folder in the game directory (Steam\SteamApps\common\Fallout 4\Data)
Navigate to My Documents/My Games/Fallout4
Open the file Fallout4.ini
Locate the value
sResourceDataDirsFinal=STRINGS\,
And change its value to
sResourceDataDirsFinal=STRINGS\, TEXTURES\
Save the changes
Right click the file and set it to be Read Only.
Uninstall
Remove the files
ReconRifle_scope_1_d.dds
ReconPistol_scope_1_d.dds
From the folder Fallout 4\Data\Textures\Weapons\ReconScope