-Create a folder called "source" and a folder called "results"
-Run CodeWalker dev48 "RPF explorer" and click in Tools > Asset Converter
-Select the "source" folder for the "Input folder" field
-Select the "results" folder for the "Output folder" field
-Click in "Process"
-After process ends, open the "results" folder and drag the "content" folder back to the OIV file that is opened in winzip or winrar
Done, install the package using OpenIV choosing Mods folder
To download the CodeWalker dev 48 release you need to join their Discord server and download the file in the "releases" channel, this guide shows this process: