Hi Ramón,
Thank you for reaching out to us.
If you upgrade from the Personal plan to the Business plan, you only need to pay the price difference between the two plans, not the full price. The remaining value of your current plan will be automatically applied to the upgrade.
If you need help or have any questions, feel free to let us know.
We are happy to help.
...................................................
Sincerely,
Ahmad.
Nicepage Support Team
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Unless it's over 30 days.
Then it might be a little more than the difference since it extends the year of included updates.