Did the install into mu-plugins folder and moved si-captcha.php there as well. BUT I have 2 problems...
#1 - I get the following error when trying to "update options"
"The requested URL /wp-admin/wpmu-admin.php was not found on this server."
#2 - "There is a problem with the directory /wp-content/plugins/si-captcha-for-wordpress/captcha-secureimage/captcha-temp/."
Why is this still looking in the normal plugins folder and not mu-plugins?
I have tried to reinstall 3 times and get the same everytime, its late so I'm probably overlooking something.