When you install a booster pack, the files are automatically installed/stored here:
C:\Users\YourName\Documents\Scrapbook MAX! 2.0\Gallery\Images
If you look at the Images folder, you'll notice that there are different folders:
So now take an example. You want to import a kit that we will call MyKit.
1. In the Backgrounds Folder create a folder that you will name: MyKit. Then add inside all the papers of the kit (.jpg files).
2. In the Embellishments Folder create a folder that you will name: MyKit. Then add inside all the embies of the kit (.png files).
3. If you have shapes (.png files), do the same thing for the Shapes folder.
Each name should be unique inside these folders.
If for a reason or another one you have two embies or papers with the same name, you will have to rename the files.
And each kit name should be unique at the same hierarchy level. That sounds logical.
If in a same kit you have two alphas the embies will probably follow the same naming convention ie A, B, C... 1, 2, 3,4... so you couldn't put the 2 alphas in the same folder, unless you rename the embies to get unique names. However I wouldn't recommend that.
In this case you could create in \Users\YourName\Documents\Scrapbook MAX! 2.0\Gallery\Images\Embellishments 2 folders:
This method is better. Why? The folder will then be loaded faster and you'll find the embies faster... more user friendly for you.