Fantastico is not installed at the default location
If you see the error "Fantastico is not installed at the default location /usr/local/cpanel/3rdparty/fantastico", this means Fantastico was installed in a non-standard location or was not installed at all.
Solution 1: Move Fantastico to Default Location
If Fantastico is installed in a different location, you can create a symlink or move it:
ln -s /path/to/fantastico /usr/local/cpanel/3rdparty/fantastico
Solution 2: Reinstall Fantastico
If Fantastico is not installed at all, you need to purchase and install it. Fantastico is a commercial product available from Netenberg.
To install, SSH to your server as root and follow the installation instructions from the Fantastico website.
Solution 3: Use Softaculous Instead
Softaculous is a free alternative to Fantastico that provides one-click installation of hundreds of scripts including WordPress, Joomla, and Drupal. It integrates with cPanel and is available from:
cd /usr/local
wget -N http://files.softaculous.com/install.sh
chmod 755 install.sh
./install.sh