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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
If you still have issues after that, you could always use rclone to download and there's a sideload section under homebrew I believe with easy ways to sideload. They aren't as good as Rookies but should get you started at least and if you still have issues could at least help you pinpoint that the issue is actually rookies. Autoinstall or quest app manager work the same but without the frills and features rookies has. There's also Quest Sidenoder which is a little closer to rookies and allows you to download and install on the same device and uses the same mirrors as rookies/rclone. Here's the install instructions they can be a little hard to find on the GitHub. Hope you figure out your issue, if you do please report what works for you. Sorry for the info overload