I’ve had the same problem as described above, this is, couldn’t even open the admin area to upgrade the plugin.
My solution:
1
I’ve changed the line 268 of the file plugin.php
changed it to: “$filePath = ABSPATH.DIRECTORY_SEPARATOR.’/wp-content/ads.txt’;”
2
Created the file ads.txt on the /wp-content/ folder where every user has write permissions.
3
Opened the admin area and updated the plugin as usual
Good luck.
