Our company is using Redash version 3.0.0, a very old version 
From last 2 days we are not able to run any query on redash. Is 3.0.0 decommissioned?
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It sounds like you’re probably running a self-hosted version of the Redash application, so the issue is likely to be in your environment and not related to anything Redash have done.
jesse
3
It’s not decommissioned. But it’s very old. As @griffinator76 mentioned, your environment probably changed.