Hello @marcusfuto,
Can you see any errors in console or somewhere where it shows what’s wrong?
First,
Delete the Plugin CF7 GoogleSheet Connector from Plugin page and make sure that folder is deleted from wp-contents/plugins, if not then delete manually..
Then, Try to install again and activate,
If Still having the same issue
then Enable the Debug Log in your WP Site
Open wp-config.php and Paste the following code
NOTE: You must insert this BEFORE /* That’s all, stop editing! Happy blogging. */ in the wp-config.php file
// Enable WP_DEBUG mode
define( 'WP_DEBUG', true );
// Enable Debug logging to the /wp-content/debug.log file
define( 'WP_DEBUG_LOG', true );
// Disable display of errors and warnings
define( 'WP_DEBUG_DISPLAY', true);
// Use dev versions of core JS and CSS files (only needed if you are modifying these core files)
define( 'SCRIPT_DEBUG', true );
After that try to Activate the Plugin, then open the debug.log under wp-contents
you will see some errors here, attach or send here, which helps to troubleshoot the issue,
Thanks
Abdullah !