Hello Hanna, 

Thank you for reaching out to us.

The price that you would pay for the upgrade would be a pro-rated charge, meaning you won't be paying for the price difference between licenses, since we cannot refund the time spent on the license you currently have.

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Example:

You bought a Basic Yearly license for Amelia, which costs $79 (roughly $0.22 per day). 

After 100 days, you want to upgrade to Pro Yearly, which costs $119 (roughly $0.33 per day). 

Time remaining on Basic (what going to reduce the upgrade price): $58.3 (265 * 0.16) 

Time spent on Basic: $22 (100 * 0.22) 

Time remaining on Pro: $87.45 (265 * 0.33) 

So, the price is not Pro - Basic (119-79=40), but instead a pro-rated charge, and you are going to be charged around $87.45 - $58.3 = $29.15.

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Your subscription renews on the same date (1 year after purchase) and your purchase code remains the same.

If you need some further assistance, please don't hesitate to contact us.

Have a nice day!