Sorry for the inconvenience, we have to have some security measures in place on the app log in to prevent abuse from scammers trying to steal accounts.
In order to avoid captcha during login anywhere on the site & app then I recommend enabling two factor authentication on your account: https://itch.io/user/settings/two-factor-auth
Alternatively, if you log into your account on your browser on the same network, then next time you attempt to login on the app it will bypass the captcha check.