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To download firmware on a linux box we do this. Note the quotes and the first argument being the name of the file:
wget -O vJunosEvolved-23.1R1.8.qcow 'https://cdn.juniper.net/software/vJunosEvolved/23.1R1/vJunosEvolved-23.1R1.8.qcow2?SM_USER=anon&__gda__=1698509807_c35687beb2d6e8765dc442c290e8231a'