If you already have, or recently received, a 31-character license number, v5.4 is the latest version available for a free upgrade. https://education.ti.com/en/software/details/en/26ABB1E073C34E88A8B730524B90A7CB/ti-nspirecx_pc_full_5_4
This web page is intended for educators only. We respectfully request that you keep this web page address private. https://education.ti.com/en/software/details/en/701A579952A74C2B8FC0D6FE0B1B34C0/ti-navigator-h
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