@ecterrab 

Hi Edgardo,

I am fully aware that Maple has greatly improved for doing tensor calculations in General Relativity.

However I have lots of worksheets using GRTensor which worked fine at least up to Maple 11.

As some of the metrics I am using are relatively complicated, I prefer to still use GRTensor. which handles them in a much more compact way. In fact I am working on some generalization of GR (scalar-tensor theories) , where the Ricci-tensor typically has thousands of terms. A conversion to a pure Maple Physics worksheet would therefore be too time-consuming and error-prone.