I will make a link to this in the description. Please hit me a youtube sub if this is useful to you :)

Simply copy this folder to your saved games folder usualy something like

C:\users\<YourWindowsProfileName>\Saved Games\DCS\Mods\Tech

If you do not see the mods folder, simply create it, same for the tech folder.

It seems safe to keep your Blend files in here. I have seen no issues in DCS keeping them there, but things are subject to change.

Sometimes the mesh changes you have made change live in Model Viewer 2, but you must restart DCS each time you export, or change the LUA.
