Hello, @sophie,
Unfortunately, I can’t open your screenshots, try to use Lightshot program:
http://app.prntscr.com/en/download.html
Go to this page https://en-gb.wordpress.org/plugins/woocommerce/advanced/, scroll to the bottom where it says previous versions, download 3.0.4 to you PC and FTP to your web / plugins folder.
Also, disable 3-rd party plugins and let me know the result.
Regards,
Rose Tyler.