KNIME promises backwards compatibility, but this is about forward compatibility so I cannot guarantee anything. However, I’d guess it should be possible with a minor change to your knime.ini.
Important:
Workflows containing executed nodes that make use of KNIME’s native table store format (nodes with black triangle output port) can be opened with 3.7, but the stored data cannot be read. The reason for this is that KNIME 4.0 uses a different compression. Therefore, if you want to share executed workflows with < 4.0 users make sure to add the the following line to your 4.0 knime.ini
-Dknime.compress.io=GZIP
Note: Also tables written with the Table Writer node in 4.0 cannot be read in < 4.0 if you don’t include this line.
Things to keep in mind:
- Workflows containing nodes introduced with 4.0 cannot be used in 3.7
- Whenever you open a workflow that was created with 4.0 you’ll get informed / warned when opening it with 3.7
- Some of the extensions, e.g., the Palladian are not yet available for 4.0, see Palladian nodes gone after update to knime 4.0.
Some extension cannot directly be installed from within KNIME Analytics Platform, e.g., Selenium, see Announcement: Selenium Nodes 4.0 released