Please bear with me, I don't know Linux well.
I have Knoppix 8.1 on usb. Firefox tells me it is critically out of date.
I ran apt-get...
KNOPPIX 8.1 LINUX LIVE DVD - 2018 For Sale
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KNOPPIX 8.1 LINUX LIVE DVD - 2018: $7
One (1) DVD of KNOPPIX This is a bootable live system on one DVD. It is consisting of a representative collection of GNU/Linux software,automatic hardware detection, and support for many graphics cards, sound cards, SCSI and USB devices and other peripherals.