Install Woocommerce Plugin on Non Compatible Wordpress Theme

Hey guys, Looking for some support installing Woocommerce onto my page.

Here is a breakdown of my issue:
my website:

  • The plugin is not compatible with my theme and the developer has advised they are not offering it with the theme so I will need to do it myself.

  • I have tried to install WooCommerce on my site.

  • After installation & activation, I can’t navigate anywhere as my site keeps trying to download a file.

  • The only way to fix this is to delete the .htaccess file and then my site works again.

  • There are also issues with permalinks that I cannot fix that keeps causing the 404 error as well.