Downloading to an older version

I'm guessing you made a typo and meant 10.12 instead of 10.2???

Here is a link for 10.12 Sierra installer -- https://support.apple.com/en-us/HT208202 which is an Apple article that contains the real link which is Download macOS Sierra which seems to be working (i started the download but did not let it complete as don't need Sierra for anything).

Good luck...

no 10.2 is Jaguar https://en.wikipedia.org/wiki/MacOS_version_history#Version_10.2:_"Jaguar"

it will not run native on an intel cpu

You can try using "virtual" machines but you need a pretty beefy machine (lots of memory, disk and CPU horsepower) to make that very effective. You can go back, by installing the older os onto another drive and then boot from that (overwriting the existing volume can be a little tricky and you need full backups that you've verified are good before starting). There are plenty of discussions in these forums with all the detail you want -- just do a little searching...

Good luck...