While installing Owncloud through softaculous, you may get the following error.
suPHP must be enabled to install Owncloud
This is because of the suphp configuration in softaculous admin panel.
To resolve the issue, login to the WHM >> Plugins >> softaculous – Instant Installs >> Settings >> Under General Settings Change the values;
CHMOD Files to 644
CHMOD Directories to 755
CHMOD Config files to 644
save the changes and try to install the script. It should be installed without any error.