Hi Alexander,
We haven’t heard back from you in a while, so I’m going to mark this as resolved – if you have any further questions, you can start a new thread.
Also, if the above options provided by the community did not help, I would recommend making sure all themes and plugins are updated and then try uploading WooCommerce from Add Plugins tab here:
Link to image: https://cld.wthms.co/1shWXP
If that still does not help, try conflict testing:
1. Temporarily switch your theme to the Storefront(https://woocommerce.com/products/storefront/) or TwentySeventeen(https://www.ads-software.com/themes/twentyseventeen/) theme.
2. Upload WooCommerce. If it doesn’t work, continue to the next step.
3. Temporarily deactivate all plugins. You can do this manually or use Meks Quick Plugin Disabler(https-//www.ads-software.com/plugins/meks-quick-plugin-disabler/).
4. Try to reproduce the problem again. If the problem is resolved, it is a plugin conflict.
5. Reactivate each plugin one by one, testing after each, until you find the one causing conflict. That will be the culprit and contacting the developers/support team of that plugin is recommended.
If you do not want to interrupt your live site during testing, you can clone your site to a staging environment and perform tests without modifying your live site or impacting customers. Many hosts provide staging facilities, so it’s worth checking in with them. It’s also possible to do it using the free WP Staging(https-//www.ads-software.com/plugins/wp-staging/) plugin.
As always, backing up your live site before any testing and updates is highly recommended.
Thanks,
Yuki