Miquel,
I hope you are having a great weekend thus far! Displaying a link/button to purchase tickets in list view has never been a default feature and would require a little customization to make it happen.
Our Themer’s Guide is the best way to create and save customizations. I found this snippet which might help, though I didn’t test it myself.
You’ll have to handle customizations yourself. For what is covered in the support forums, please review our What support is provided for license holders? Knowledgebase article.
If you get caught up along the way, feel free to reply back with any specific questions you have and I’ll do my best to accommodate. Lastly, we see this request a lot, so please take a moment and upvote/submit the request to our UserVoice Feature Ideas page.
Thanks and have a pleasant rest of your weekend. Cheers!