The 1.x version was a freeware whereas the 2.x is a shareware. Here is how they compare:

                      1.x (freeware) 2.x (no cost) 2.x (cost 10$)
Upload calendars to 
FTP server----------------Yes            Yes            Yes
Manage several 
configs-------------------No             Yes            Yes
Install or upgrade
iPHP calendar-------------No             Yes            Yes
Delete already 
uploaded cal files--------No             Yes            Yes
Manually add .ics 
files---------------------No             Yes            Yes
Run a background 
daemon that checks
for changes in iCal 
and automatically 
uploads changed 
calendars to all 
available configs---------No             No             Yes

The fees are not to simply perform FTP (contrary to what "chezpaul" says), they cover the daemon tool.

Why 10$ ?

To make this software is not free for me. I pay approximatly 530 $ for the development software and two add-ons. FTP iCal calendars is downloaded by approximatly 200 persons for each release. If 25% of these persons pay for the shareware, it will permit me to cover the developing cost (not taking into account my time).