We have one project which has a custom theme in vendor folder. Like
<?php \Magento\Framework\Component\ComponentRegistrar::register( \Magento\Framework\Component\ComponentRegistrar::THEME, 'frontend/Vendor/customtheme', __DIR__ );
Now I need to override some files from the custom theme. So I created theme folder in
app/code/design as per registation.php
But unfortunately, not working.
I know the one way to override vendor custom theme files, create and register new theme with a parent vendor custom theme to make this work.
But I would like to know if there is any other way to work this without creating another theme?
Note: the Custom theme is developed by previous company and they do not provide composer credentials to update custom theme from the composer. So we must override custom vendor theme to