I'm rebuilding my website, does this mean I'll have to repay for my addons?

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So pretty much I have to do a rebuild on my website, we had a web designer build it for us in the past, but now we created a new concrete account and linked it to our project (we don't have the web designer's account info.) I'm looking at the addons, mainly the eCommerce one, $125, I really hope there is a way to not have to repay for that. If someone could point me in the right direction of who to talk who could help us with this that would be awesome!