Nick Verwymeren on "[Plugin: Quantities and Units for WooCommerce] 500 Error"

Immediately after installing and clicking "Activate plugin" the site went down and showed a 500 error screen. Had to go to cPanel and delete the plugin from files.
I couldn't even access my files from FillaZilla. Not installing this again. Ever.

https://wordpress.org/plugins/quantities-and-units-for-woocommerce/

Please check the version of PHP that is running on your server. If you're running anything before 5.3 you will get this error. I'd suggest talking to your host about upgrading since 5.2 has not been maintained in over 2 years (last release was over 5 years ago).

running on 5.6.17

Did you happen to see the error in the logs? I just tried installing on a new wordpress installation using php 5.6 and didn't have any issues. I know another person mentioned an issue on 5.6 but I cannot reproduce the issue.

You can also try installing this plugin to make absolutely sure you're on 5.6:
https://wordpress.org/plugins/display-php-version/

Sometimes hosts incorrectly state the php version that's actually running your wordpress code.