In their wiki page, it shows that :
Download the parameters for your sector size (256Mib)
proofs/bin/paramfetch -j proofs/misc/parameters.json -z 1024,268435456
But, where is the proofs/bin and where is the proofs/misc ?
I have no idea, but there is a Filecoin-dedicated forum : https://discuss.filecoin.io
I’m sure someone will be able to help you there. 
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