Hi. Using v1912 now. Everything seems to work well on install. I am trying to use solvers and BC's built on old versions specifically 1806. In CHTmultiregionfoam a function in createsolidfields.h uses the member "transformVector" when in 1912 it uses "transformPrinciple." This is the same in setRegionSolidFields.h. I was unable to find a way to use older version standards without installing the older version. I have a lot of solvers from the old version and it would be quite tedious to go through and update all my solvers. Could you guide me to a forum or solved issue that is the same as this. Or potentially guide me through a solution. If none exists I will bite the bullet but I'm unsure of how many potential deprecated uses I will run into beyond this one.