Changing the two required lines to fix pro version results in white screen

I tried fixing the pro version as suggested in your blog – following all instructions correctly. This is not the first time I’m editing files either so I think I know what I’m doing.

However – the changes result in my site being unaccessible and returning nothing but a white screen, no errors or anything.

I’ve reverted back to the old version just so I can at least have the rest of the website up, of course with the deactivated plugin.

WP Version: 3.9.1–de_DE
EMP Version before fixing it: 2.242

Any help appreciated,

https://wordpress.org/plugins/events-manager/