Hey there.
Sorry that this happened to you. Itch.io can refund your payment, and you can use the refund to buy the correct version. I think that's probably the best thing to do in this situation. If I simply have you the plugin, you wouldn't have bought it, and you wouldn't be able to download updates for it in the future.
I'm not sure how long it takes them to process a refund, it might take a while, so apologies in advance.
~Ramza