Upgrading to pro

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Note: I have no issues, just an upgrade question
The issue can be found here: https://www.lifepolicydetective.co.uk
The preview works: Yes
It works with other themes: Haven’t Tried
It works when I disable all other plugins: Not necessary – no issues
Meta Slider version: 2.8 beta
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I’m using the free version and really like it. I’m considering an upgrade to the Pro version.

Here’s my question: If I buy a single site license initially, can I later upgrade to a multi site license or developer license for the difference in price?

https://www.ads-software.com/plugins/ml-slider/