To test pre-release versions, build the .deb packages and re-run the installer:
./hst_autocompile.sh --hestia branchname no
./hst-install.sh … --with-debs /tmp/hestiacp-src/debs
curl: (60) SSL: no alternative certificate subject name matches target host name 'raw.githubusercontent.com'
More details here: https://curl.se/docs/sslcerts.html
curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.