We have just released the stable version of Indigo nodes for KNIME. You can install them from the KNIME Community Contributions update site: http://tech.knime.org/update/community-contributions/release
Information on how to update KNIME extensions automatically: http://www.knime.org/downloads/update
All the changes since the previous stable release are listed in the special topic with the announcements for nightly builds: http://tech.knime.org/forum/indigo/nightly-builds-new-nodes-and-node-changes-announcements
This release is based on the stable version of our cheminformatics toolkit Indigo 1.1: http://ggasoftware.com/opensource/indigo
All your workflows should be compatible with this release. In case of new options are added, the Indigo Node prints a warning to the standard output prompting to review the new options.
This release could not have been done without your suggestions and bug reports! Looking forward to receiving your feedback.
GGA Software Services LLC