Hi Hani.
Here’s some custom CSS to simply hide the button to avoid users clicking it:
body.post-type-archive-tribe_events .tribe-events-ical {
display: none;
}
There are more thorough solutions available via PHP, but you can easily add custom CSS code via your child theme’s style.css file or via a plugin like Simple Custom CSS or, my favorite, Jetpack. Jetpack supports regular CSS and the LESS and Sass pre-processors.
If you’re not a CSS expert, Jetpack’s Custom Design reference may prove helpful.
Please let me know how it goes for you.