Internet archive has all of them (EU,US&JP) in alphabetical libraries. Also has bios files

Resize array: https://m.youtube.com/watch?v=nV5snitWrBk

Yes you will likely have to rebuild parity. If its write once read many kind of media (for the array) zfs is a lot of overhead and learning. Z snapshots and data sets are possible with a zfs plugin. https://m.youtube.com/watch?v=pLFaDnTVpuM

Cache drive in unraid is used as temp storage before being put in the array. You don’t need a slog.

Unraid is not turenas or proxmox. Tis a different beast you sound like your trying to plan a system that would belong in truenas.

What down turn? Bud made more profit than average during the “boycott”

Dudes government shot a kid and it’s the video games fault……..good luck on the reelection

Clean your PC it’s filthy.

No you don’t need to worry about new fans 60c is normal. Now if you where at 80+ for long periods then maybe a new cooler would be worth it. Also that case has terrible airflow bigger/newer/stronger fans won’t help.

It’s likely the aio is nearing EOL as well they only really last 3-5 years and slowly loose performance over time.