this is the way i did it: (you must be logged as root)
send this command to change to the /root directory
cd /root
Now download ioncube with this command:
wget http://downloads2.ioncube.com/loader_downloads/ioncube_loaders_lin_x86.tar.gz
you will see downloading:
--03:54:53-- http://downloads2.ioncube.com/loader_downloads/ioncube_loaders_lin_x86.tar.gz
Resolving downloads2.ioncube.com... 72.9.241.122
Connecting to downloads2.ioncube.com|72.9.241.122|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 2256911 (2.2M) [application/x-gzip]
Saving to: `ioncube_loaders_lin_x86.tar.gz'
100%[=======================================>] 2,256,911 155K/s in 14s
03:55:08 (153 KB/s) - `ioncube_loaders_lin_x86.tar.gz' saved [2256911/2256911]
once it has completed dowloading then untar it with this command:
tar xvfz ioncube_loaders_lin_x86.tar.gz
Now copy the ioncube loder you just unpacked to the ispconfig directory with this command:
cp /root/ioncube/ioncube_loader_lin_5.2.so /home/admispconfig/ispconfig/web/ioncube/ioncube_loader_lin_5.2.so
Now you can confirm that infact you copied ioncube_loader_lin_5.2.so in the ispconfig directory by sending this command:
ls /home/admispconfig/ispconfig/web/ioncube/
the OUTPUT will look like this:
ioncube_loader_lin_5.2.so
that's it