After uploading the theme to the website, the moment I clicked Activate the whole website crashed. I couldn't even get into the dashboard.

I had to go and restore to a previous days' backup through the server to be able to access the websites dashboard and change back to the original theme.

Does anyone know why that happened or how to fix that?

I even get an error before even installing it. After I click 'live preview' it says there was a critical error and to check the mailbox but there's nothing there.

Here's the log I got from the debug

The "removed" keyword in there is me removing the server/website that's all

PHP Fatal error:  Uncaught Error: Call to undefined method PenciSoledadElementorModulesPenciStickyModule::get_experimental_data() in /var/www/vhosts/removed/wp-content/themes/soledad/inc/elementor/includes/modules-manager.php:108
Stack trace:
#0 /var/www/vhosts/removed/wp-content/themes/soledad/inc/elementor/loader.php(263): PenciSoledadElementorManager->__construct()
#1 /var/www/vhosts/removed/wp-includes/class-wp-hook.php(287): PenciSoledadElementorLoader->on_elementor_init('')
#2 /var/www/vhosts/removed/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array)
#3 /var/www/vhosts/removed/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#4 /var/www/vhosts/removed/wp-content/plugins/e in /var/removed/wp-content/themes/soledad/inc/elementor/

There's already a private one if you could go and check that out 

an open private ticket*

before installing the theme?

If I use the 6.4 wordpress version do I also have to use a specific php version? or 7.1.33 is fine

Is PHP version 8.1.27 okay? or should I use 8.0.30