Hello, I have a question about possibility to upgrade the membership before membership due date.
To be more precise I want to know if I can upgrade from Builder membership to Advanced membership bought for an year and pay only the difference between the price of this two membership.
Hi ileavlad5t9o47f, welcome to Thunkable! 
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We’d be happy to help with this request. Please click on the Help icon and select “Contact Support” in the top right Menu bar in your Project Page to connect with our Support team.
Thank you!
Hi matt_conroy, I’m currently don’t have any membership but I planned to start with the builder one, but only if I’m sure that the upgrade is possible.
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