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Usage without Bootstrap

If you're using this extension without Bootstrap you might need some own CSS for display and hide the error feedback. This could look like:

.form-control.is-invalid {
    border-color: #dc3545;
}

.is-invalid~.invalid-feedback {
    display: block;
}
.invalid-feedback {
    display: none;
    color: #dc3545;
}
Documentation
TYPO3 Double-Optin-Download Extension

TYPO3 Double Optin Download

The Double-Optin-Download extension allows you to setup your downloads so that visitors fill out an inquiry form and then get a download link via email. They can download the files using the link exactly once.

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