The EPiServer.Forms.Samples packages are not compatible with CMS 12. Is any alternate or when this will be supported for CMS 12?
Any idea would be helpful to upgrade the EPiServer.Forms.Samples.
According to this page: https://world.optimizely.com/resources/net5/add-ons/
The update for CMS 12 is still "In Progress".
If you need something specific sooner, here's the GitHub repo: https://github.com/episerver/EPiServer.Forms.Samples
I needed to pull out the "Submitted Form" visitor group criteria for my CMS 12 project. I didn't find any issues with it in CMS 12.