For instance, an Upgrade from v7 to v8.
https://www.macrium.com/release-8-faq
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2.1 Q: Will I be eligible for a free upgrade?
2.1 A: If you purchased on or since the 15th November 2020, you will be eligible for a free upgrade to Reflect 8. Any older Reflect 7 key, and Reflect 6 home keys will be upgradable with a 50% discount.
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For me, that would be a 50% discount if/when I wanted to upgrade to v8 on my main system with the Paid version.