*UPDATE*
I apologize for being so late with this, but I haven't really been paying attention to the game lately.
The location of the mods directory has changed, so here are some instructions on where to put the mods directory.
*NOTE*
For me, it seems the game auto moved my mods to the correct directory, so be sure to check if the game did the same to you.
Anyways,
Step 1 go to the following location:
C:\Users\YOUR_USER_NAME\AppData\Roaming\7DaysToDie\
Step 2 Look for a directory called Mods
Step 3 If there is no directory, create a directory called Mods
Step 4 Copy all of the mod files to that directory.
Step 5 Each mod can be in its own directory (see image below)
Last step is the most important - Have Fun!
- Pahbi