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Student Software license

I need help about this matter:

In 2015, I bought the product TI-Nspire CX II CAS but I forgot my license number. The problem is that I don't have the packing product and I lost the bill.

I need to have the TI-Nspire CX CAS Student Software for teaching maths to my students using the desktop sharing option on my computer.

Thank you for your attention
Kind regards.
Arley David Celis Vargas