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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.
I can't help on the error,but if you don't want to use Epic Games Launcher there is another Launcher called Heroic Games Launcher,it connects to your Epic Games account and you can play it without using the official launcher,you can even create a shortcut of the game so you don't even have to open the Heroic Games Launcher.
I use legendary as a replacement for the launcher. It's CLI and makes it really easy to launch any epic game from any of your accounts.
Use Steam ROM Manager https://github.com/SteamGridDB/steam-rom-manager