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@Hitscanister clarification, I am new to GTA V modding in general

I don't fully understand the installation guide. I see that there appears to be two separate installation paths for most of the weapons (Bullpup rifle:mods/update/update.rpf
mods/x64w/dlcpacks/mpbusiness2/dlc.rpf/common/data/ai), but I don't know which one to place what override in.
I also don't know where to place the remaining weapons that aren't listed in the installation guide

Downloaded it, but it the smuggler doesn't show up. Tried reinstalling the script multiple times, but it won't load.

Here's what my log says:

[12:57:34] [DEBUG] Created script domain 'ScriptDomain_E3275075' with v2.10.9.
[12:57:34] [DEBUG] Loading scripts from 'D:\Steam\steamapps\common\Grand Theft Auto V\scripts' into script domain 'ScriptDomain_E3275075' ...
[12:57:34] [INFO] Loading assembly 'GunSmuggler.dll' ...
[12:57:34] [DEBUG] Found 1 script(s) in 'GunSmuggler.dll'.
[12:57:34] [DEBUG] Starting 1 script(s) ...
[12:57:34] [DEBUG] Instantiating script 'RP.Mk2' in script domain 'ScriptDomain_E3275075' ...
[12:57:34] [ERROR] Failed to instantiate script 'RP.Mk2' because constructor threw an exception:
System.IO.FileNotFoundException: Could not load file or assembly 'NativeUI, Version=1.7.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies.
Filnavn: NativeUI, Version=1.7.0.0, Culture=neutral, PublicKeyToken=null
ved RP.Mk2..ctor()

WRN: Assembly binding logging is turned OFF.
To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.
Note: There is some performance penalty associated with assembly bind failure logging.
To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].