I tried automatic update from v3.4.7 (I think) to v3.4.10 but that caused a fatal error:
PHP Warning: require_once(/web/wp/wp-content/plugins/types/application/bootstrap.php): failed to open stream: No such file or directory in /web/wp/wp-content/plugins/types/wpcf.php on line 75 PHP Fatal error: require_once(): Failed opening required '/web/wp/wp-content/plugins/types/application/bootstrap.php' (include_path='.:/usr/local/lib/php') in /web/wp/wp-content/plugins/types/wpcf.php on line 75 WSP-DEFAULT: Tweaker: ERROR: Server-side error detected: HTTP/1.1 500 Internal Server Error. Backtrace: #0 WebsitePro\Logger::debugBacktrace() called at [/var/wordpress/add-ons/website-pro/plugins/includes/wsp-tweaker.php:69] #1 WebsitePro\Tweaker->trace_5xx_status_headers(HTTP/1.1 500 Internal Server Error, 500, Internal Server Error, HTTP/1.1) called at [/web/wp/wp-includes/class-wp-hook.php:292] #2 WP_Hook->apply_filters(HTTP/1.1 500 Internal Server Error, Array ([0] => HTTP/1.1 500 Internal Server Error,[1] => 500,[2] => Internal Server Error,[3] => HTTP/1.1)) called at [/web/wp/w...
I deleted the plugin via SFTP and the 524 error went away. Then I tried installing the fresh .zip download and it caused 500 error again, just from trying to install, not even activate.