Freepbx15 does not support asterisk18

Unsupported Version of 18.1.0
Supported Asterisk versions: 13, 14, 15, 16, 17

I tried to modify install.php but  was unable as I was to freepbx13 install to get it to allow me to continue i give up went to 16 can someone address this!

1. wget http://mirror.freepbx.org/modules/packages/freepbx/freepbx-15.0-latest.tgz
   tar xvf freepbx-15.0-latest.tgz
   cd freepbx
   freepbx# sudo ./install
   Database engine [mysql]:
   Database name [asterisk]:
   Database server address [localhost]:
   CDR Database name [asteriskcdrdb]:
   Database username [root]:
   Database password:
   File owner user [asterisk]:
   File owner group [asterisk]:
   Filesystem location from which FreePBX files will be served [/var/www/html]:
   Filesystem location from which Asterisk configuration files will be served [/etc/asterisk]:
   Filesystem location for Asterisk modules [/usr/lib/asterisk/modules]:
   Filesystem location for Asterisk lib files [/var/lib/asterisk]:
   Filesystem location for Asterisk agi files [/var/lib/asterisk/agi-bin]:
   Location of the Asterisk spool directory [/var/spool/asterisk]:
   Location of the Asterisk run directory [/var/run/asterisk]:
   Location of the Asterisk log files [/var/log/asterisk]:
   Location of the FreePBX command line scripts [/var/lib/asterisk/bin]:
   Location of the FreePBX (root) command line scripts [/usr/sbin]:
   Location of the Apache cgi-bin executables [/var/www/cgi-bin]:
   Directory for FreePBX html5 playback files [/var/lib/asterisk/playback]:
   Assuming you are Database Root
   Checking if SELinux is enabled...Its not (good)!
   Reading /etc/asterisk/asterisk.conf...Done
   Checking if Asterisk is running and we can talk to it as the 'asterisk' user...Error!
   Unsupported Version of 18.1.0
   Supported Asterisk versions: 13, 14, 15, 16, 17