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Hello, I’m trying to update a site that is very old to a new free theme. I’m having trouble customizing the theme with brand colors and can’t even get the featured image function to work. Do I need to use a page builder? I use Divi for another site, but was trying to stick with a free theme/page builder for this one
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Choose a theme that matches your requirements.
Try GeneratePress or Kadence for a lightweight theme with loads of options.
Either choose a theme which is built for the version of WP you are on or upgrade the WP version to a newer one. This is normal best practice anyhow – surely there are a bunch of security holes in an old version of WP you’d want to remove by upgrading.