I built a new pc and when I put mods into the mod folder of ets2 then go to edit profile the mods aren't showing up all the mods are1.15x
Are you sure you that that you've properly extracted the mods after downloading them, so you're left with just a .scs file? In my experience its usually little mistakes like that leads to the biggest problems :P
If you've done everything up to there right and none are showing, attach your game.log file to a post here and that should shed some more light on what is going on! Its found usually at C:/Users/
Your Username/Documents/Euro Truck Simulator 2/