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Codes (TKP-…) and being offline
From the app’s Help panel
Codes (TKP-…) and being offline
A code works offline the moment you paste it. If it has a use limit, the computer reports the redemption to tentaku.app the next time you're online; a code that turns out to be over its limit then ends, and the Settings → License line and the header pill tell you. Some codes are marked online-only — those need internet when you paste them. A code can't be applied on top of a paid key: clear the key first. Ending a code only ever ends Pro that came from a code — a paid key is never touched.
Promo codes are personal. A code used more times than it allows may be revoked; only Pro from that code ends — paid keys and your notes are never affected.
Still stuck? Email [email protected] — include which tab you were on and what you pressed.