To test pre-release versions, build the .deb packages and re-run the installer:
./hst_autocompile.sh –all branchname no
./hst-install.sh … --with-debs /tmp/hestiacp-src/debs
Read the text you will need build the packages your self
Or download the 1.3.0~beta packages 1.3.0 RC - We need YOU!