“Save fer later”
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If you mean Linux, you can test drive it without installing it by downloading the “live” ISO and burning it on to DVD or USB stick and then run it from the disk/usb.
If you want to buy a live disk or USB already installed, you can get them here:
https://www.osdisc.com
If you’re used to Windows, look for one that is made for people coming from Windows. I find Lubuntu the best for my use.
The one thing about running a live version from CD or USB is it doesn’t run as well (i.e. fast) as it would if installed on an actual hard drive.
You can install to a hard drive from a live disk or USB.
It’s not too hard to install a whole system on to a USB stick, too - so you can just pop it into most any machine and it’ll run from the USB drive. I have a couple of diff Linux distros I run from USB sticks. Still works best installed on a hard drive, tho.
Thanks for the info !