Hi Andreas, thanks for your response.
I was able to import the JSON-LD file into openLCA by 1) downloading the zip file from nexus, (2) creating a new folder in my downloads, (3) moving the zip file into the new folder, (4) File>Import>Other>Linked Data (JSON-LD)>From directory>Browse, (5) selecting the new folder containing the zip folder under downloads, (5) clicking the zip folder and clicking finish.
However, only the "IPCC 2021 AR6" impact assessment method can be found under "openLCA LCIA methods 2_1_3" instead of the 43 methods it should contain. Is this because I have methods pack "LCIA_2_0_3" imported already? Or is it because I have ecoinvent 3.5 downloaded and "openLCA LCIA methods 2_1_3" is compatible with ecoinvent 3.8? Thanks for your help.