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I have a number of notebooks written for whatever the current version was of Mathematica in 2019 (not 1919 as I had earlier) and using the ccgrg package for general relativity. They now no longer work. There is no error, but the key functions such as tRicciR[a,b] that should give something like

tRicciR[1, 1] (* (2 [Alpha] [Lambda] + x^2 [Beta]^2 [Lambda]^2 + y^2 [Beta]^2 [Lambda]^2 + 4 z^2 [Beta]^2 [Lambda]^2 - *********** *) 

but just return tRicciR[a,b] rather than evaluating the function. Is this a known problem? And If there is no way to get ccgrg to run in 12, is there a way to resurrect the 2019 version of Mathematica? I've lost a lot of work if it is a dead package

Here is the outpout that fails at the first ccgrg call:

I have a number of notebooks written for whatever the current version was of Mathematica in 2019 (not 1919 as I had earlier) and using the ccgrg package for general relativity. They now no longer work. There is no error, but the key functions such as tRicciR[a,b] that should give something like

tRicciR[1, 1] (* (2 α λ + x^2 β^2 λ^2 + y^2 β^2 λ^2 + 4 z^2 β^2 λ^2 - *********** *) 

but just return tRicciR[a,b] rather than evaluating the function. Is this a known problem? And If there is no way to get ccgrg to run in 12, is there a way to resurrect the 2019 version of Mathematica? I've lost a lot of work if it is a dead package

Here is the outpout that fails at the first ccgrg call:

I have a number of notebooks written for whatever the current version was of Mathematica in 2019 (not 1919 as I had earlier) and using the ccgrg package for general relativity. They now no longer work. There is no error, but the key functions such as tRicciR[a,b] that should give something like

tRicciR[1, 1] (* (2 [Alpha] [Lambda] + x^2 [Beta]^2 [Lambda]^2 + y^2 [Beta]^2 [Lambda]^2 + 4 z^2 [Beta]^2 [Lambda]^2 - *********** *) 

but just return tRicciR[a,b] rather than evaluating the function. Is this a known problem? And If there is no way to get ccgrg to run in 12, is there a way to resurrect the 2019 version of Mathematica? I've lost a lot of work if it is a dead package

I have a number of notebooks written for whatever the current version was of Mathematica in 2019 (not 1919 as I had earlier) and using the ccgrg package for general relativity. They now no longer work. There is no error, but the key functions such as tRicciR[a,b] that should give something like

tRicciR[1, 1] (* (2 [Alpha] [Lambda] + x^2 [Beta]^2 [Lambda]^2 + y^2 [Beta]^2 [Lambda]^2 + 4 z^2 [Beta]^2 [Lambda]^2 - *********** *) 

but just return tRicciR[a,b] rather than evaluating the function. Is this a known problem? And If there is no way to get ccgrg to run in 12, is there a way to resurrect the 2019 version of Mathematica? I've lost a lot of work if it is a dead package

Here is the outpout that fails at the first ccgrg call: