Using 157b with XAMPP 8.0.0

I am trying to install ZenCart 1.5.7b on Windows in combnation with a local server XAMPP 8.0.0. I followed the instructions on https://codingtrabla.##########################/2016/06/install-zencart-155a-on-windows-xampp.html, but, but it doesn't work with ZC157b and XAMP8.0.0.

When I open http://localhost/zencart/zc_install/index.php in my browser to start installation, I get an Error 500. The XAMPP error log doesn't give me any useful information.

Does anyone recognize this problem and know how to solve it?

v1.5.7 is not built for 8.
https://docs.zen-cart.com/user/first_steps/server_requirements/
https://github.com/zencart/zencart/issues/4122

While 1.5.7 may trigger a lot of warnings on PHP 8, it should still run.
You'll need to apply the fix that torvista eluded to: https://github.com/zencart/zencart/commit/d6e434e2b757c8a615537d3a35994aba823e09ea

When you get a blank page it means a fatal error has occurred. Usually that error is recorded in the /logs/ directory of the store's files. What's the error in your case?
https://docs.zen-cart.com/user/troubleshooting/blank_page/

Thank you very much. From now on this requirements page is one of my favourites.

While 1.5.7 is not officially built to avoid all low-severity "warnings" or "notices" reported by PHP 8.0, the v1.5.7c code has some patches in it for improved PHP 8.0 compatibility.

You can get the unofficial 1.5.7c (or latest 1.5.7-series) from https://github.com/zencart/zencart/tree/v157 by clicking on the green "Code" button and choosing "Download ZIP".

I am trying to install zen-cart-v1.5.7c-03052021 on XAMPP (PHP Version 8.0.9) and installer displays white screen. When I go to
https://localhost/store/zc_install/index.php

It shows
This page isn’t workinglocalhost is currently unable to handle this request.
HTTP ERROR 500

Any ideas how to fix it?

That Server 500 is normally accompanied by a detailed record of the underlying issue in a myDEBUG*.log file, present in the site's /logs sub-directory.