Our customer has data located in Romania, and has provided a proj string that includes non default correction and datum shift grids. I have tried to install these in FME Form (2021.2.4), yet the workbench complains it cannot locate the grid file (“PROJ: proj_create: Error -38 (failed to load datum shift file): hgridshift: could not find required grid(s).”).

I have found some links in the docs (also related to install this in FME Flow), however I'm not yet able to run this transformation in my local FME Form.

Any help is appreciated. For reference, I have included the example proj string, grids, test data and workbench. Run it with the following parameters: