See CHANGELOG.md for changes: https://github.com/indigo-astronomy/ind ... ANGELOG.md
The most important change is, that indigo_ccd_ptp is now the primary DSLR driver (and indigo_ccd_ica and indigo_ccd_gphoto2 are obsoleted).
If automatic update will fail for any reason, connect to INDIGO Sky with SSH (user and password "indigo") and execute the following commands
sudo find /var/cache/apt/ -type f -exec rm -v {} \;
sudo find /var/lib/apt/lists -type f -exec rm -v {} \;
sudo apt update
sudo apt install indigo