This release provides support for TWS/Gateway 1034 running on Linux. For this release, IBKR have updated the installer so that, on Linux, TWS and Gateway use the Azul Zulu Java 17 runtime environment rather than the Oracle 8 JRE used in previous releases.
NB: TWS/Gateway 1034 on Linux will not work with previous releases of IBC.
If you are not running TWS/Gateway 1034 on Linux, you do not need to upgrade to this release. There are a couple of other minor changes in this release, but no harm should occur if you don't install this release on Windows.
To do this upgrade from IBC 3.20.0 it is only necessary to extract the 'IBC.jar' and 'version' files to your IBC installation folder, and extract the ibccstart.sh script to your scripts subfolder.
If you are currently using an earlier IBC version than 3.20.0, do a full install.
[The situation with macOS is uncertain at present. It would be helpful if someone with a macOS machine could experiment with IBC 3.20.0 and TWS/Gateway 1034, and if that doesn't work try updating to IBC 3.21.0. Feed back the results via the issues register.]