free modules

hi

i want to try clearos for a mailserver and fetchmail service (i need only 1 mail)
but when i try to install mail applications (only smtp , imap and pop server) wizzard ask me to insert credit card details because some modules selecteted need paid.
i checked 4 times but none of modules is paid, also if i filter for paied modules, result is 0

i i cannot install mail service...

what's wrong?