Investigate if it is possible to show a more specific error message or to display the captcha dialog.

Other approach:
I know that jdownloader2 opens a browser window for sites where you have to enter the google recaptcha (I'm not a robot/select images) dialog and then after you click/select the captcha, the link gets added.

Another/combined approach, also used in jdownloader2:
You can enter your google account details, which then allows more requests.