Use conditional header.php for category and procuct pages in Woocommerce

I’ve read around this subject for a while now, but most solutions focus on displaying a custom header based on different categories. In my case, it ought to be simpler – I need to call one different header.php for all Category and Single Product pages (using the defualt header for cart, checkout and so on) – Howerver – its still beyond my coding ability! My link requires a log-in as the site is under construction – but I can provide one if anyone is kind enough to have a look! Thanks in advance!

• This topic was modified 4 years, 4 months ago by Jan Dembowski. Reason: Moved to Fixing WordPress, this is not an Developing with WordPress topic

The page I need help with: [log in to see the link]