I've had just outstanding success with "view source" and grab the "on success" parameter out of the form. Some sites are bright enough to do real server-side work first, and some other sites will email the link, but I'd guess it's easily 75/25 for ones that include the link in the original page body, as does this one:

    ,after_submitting: 'https://spg.openkg.cn/en-US/download?token=0a735e9a-72ea-11ee-b962-0242ac120002'

https://mdn.alipayobjects.com/huamei_xgb3qj/afts/file/A*6gpq...