I implemented a FactorySQL project a year ago, and I know everything has moved to Ignition. I have FactorySQL only, version 4.2.9.0
Without spending money, what is the latest version I can get of FactorySQL or Ignition? Any recommendations?
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Latest FSQL is 4.2.12. That’s the only free route you have.
If you already have a nice, mature application that you’re using, then upgrading to ignition may not make sense to do. Just my two cents. 
Regards,