STEP 1: Login to your MyArturia account or create an Arturia MyArturia account - http://arturia.com/login

STEP 2: In your Arturia account click on “Register a new product”

STEP 3: Enter your serial and unlock code. Your serial and unlock will look like: XXXX-XXXX-XXXX-XXXX,YYYYYYYY. 
The X are the serial number and the Y are for the unlock code, separated by a comma. Please make sure to enter the serial and unlock code separately in the two corresponding fields.

STEP 4: Download the V Collection from this page : http://www.arturia.com/v-collection/resources and install it.

STEP 5: The Arturia Software Center has been auto-installed with the V Collection 5. Open it and use it to activate your V Collection 5.

STEP 6: Enjoy!

Need additional assistance? Check out Arturia's FAQ page.