I’m sure we can get either the official or this downloader working for you. Are you able to attend the monthly drop is session today, we can do a screen share and get things working?
I would be tempted to move uranium and iron to the element section
So you have
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openmc_data_downloader -l TENDL-2019 -e U Li Na Si Fe
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Then export the environmental variable.
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export OPENMC_CROSS_SECTIONS=home/dalia/cross_sections.xml
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