I found the error. Got the premium version and my site got critical error upon activation.
The problem is that the ZIP file that Pro version gives you contains the version number in the install folder. I installed using WP installer. Did not extract and upload via FTP.
The error I was getting was:
[30-Nov-2021 18:44:33 UTC] PHP Warning: file_get_contents(/home/xxxxxxx/xxxxxxxxx.com/wp-content/plugins/yourplugins-wc-conditional-cart-notices-pro/composer.json): failed to open stream: No such file or directory in /home/xxxxxxx/xxxxxxxxx.com/wp-content/plugins/yourplugins-wc-conditional-cart-notices-pro-v1.0.6/vendor/yps/framework-core/includes/context.php on line 26
[30-Nov-2021 18:44:33 UTC] PHP Warning: Invalid argument supplied for foreach() in /home/xxxxxxx/xxxxxxxxx.com/wp-content/plugins/yourplugins-wc-conditional-cart-notices-pro-v1.0.6/vendor/yps/framework-core/includes/context.php on line 29
So I changed the folder name to what the error log said, and problem fixed. Here’s my Filezilla action log
Renaming '/xxxxxxxxxx.com/wp-content/plugins/yourplugins-wc-conditional-cart-notices-pro-v1.0.6' to '/xxxxxxxxxx.com/wp-content/plugins/yourplugins-wc-conditional-cart-notices-pro'