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Does the overlay come with it? The 16C has been on my list for a long time, but I didn't know that the 15C collectors edition had that capability!
I bought it in: https://www.thecalculatorstore.com/epages/eb9376.mobile/en_US/?ObjectPath=/Shops/eb9376/Products/HP15c_Enhanced
With the flash service that includes the pack you have a custom firmware that allows you to choose, with the keys g+enter+on+4, between the firmware of 15, an improved version 15.2 or that of 16c (as seen in the photo)
Another option would be to buy this fantastic modern clone: