If you want to install the Kids Appstore yourself, it's very easy:

Step 1 - Activate the option to allow installation of applications from unknown sources:

        - Go to Device Settings -> Security (Optionally enter in "Installment manager" if exists);

        - Check "Unknown Sources":

Step 2 - Download and install the store:

   - Click here to download the store. The file will be downloaded to your "Downloads" folder;

   - After download make sure the file has the extension ".apk". If it has changed to ".txt" make sure to use a file manager app and rename the file so that it's extension is ".apk";

   - Press on the store file and install it.

And that's it.. enjoy your new safe store of kids applications.