Essence
Ansys Employee

Then for such high mesh count, I would suggest you to increase your computational resources. If you are using the mesh for Fluent, try using Ansys solver as an option while exporting the mesh. Or one more option is (I do not know if this may be useful to you), try to mesh only the parts of the whole geometry and export them. Then in Fluent, you can append the case files, and merge/fuse them together.