I purchased after March 14th 2017
You purchased (or were offered) plug-ins on our reseller website https://itch.io/.
You linked your purchase to an itch.io account. Go on this page and login: https://itch.io/my-purchases
You did not link your purchase to an itch.io account. Go to this page which can send you download links again: https://itch.io/docs/buying/already-bought
I purchased before March 14th 2017
You purchased (or were offered) plug-ins on https://gumroad.com/
Then you might have received an email from itch.io with your new download key. This email has a link to get access to your purchase. Search your inbox.
If you haven't received, or can't find, such an email: please contact us at [email protected]. We'll give you your new license.
Claim the license by creating an account on itch.io. This way you will have access to future updates through https://itch.io/my-purchases.
Find the email you received from Gumroad at the time of purchase time. This email has "You bought X" in your language in the topic.
Click on the "See the Product" link.
If you purchased our products with one of our resellers:
They would have passed you an itch.io licence link
Go on this page and login: https://itch.io/my-purchases to get back your product.