Explorer HAT Pro on a RPi 3B+ (or 4)

Will the Explorer HAT Pro work on a RaspberryPi 3B+ or 4 ?

Thanks in advance

Yes, according to the product page “its compatible with all 40-pin header Raspberry Pi models”.
It did work on a 3B+ and should work on a Pi 4. I say should because that was put on the product page before the arrival of the Pi 4 and Buster. Buster seems to have caused a few things to now not work the way they used to in earlier versions of Raspbian. You won’t know if anything is amiss until you run the one line installer and try some of the examples.
I have several Explorer pHats on Pi Zero’s running Stretch. I haven’t updated any of them to Buster yet. They run headless and were working the last time I booted up one of those Pi’s so I’ve just left them as is. Don’t fix what’s not broken. ;)

Thanks. I’m working on some projects for a Makers Space Club at the school where I work, using a 3B+.

If you run into any issues with Raspbian Buster, you can get older versions of Raspbian here.

I tried to “apt-get install python3-explorerhat” and got an error that the package could not be found. I tried “apt-get install updates” and it downloaded about 30MB, but still got the same error for the explorerhat. I’m running Ubuntu MATE 18.04.3 LTS on a 3B+.

tried the CURL command: curl -sS get.pimoroni.com/explorerhat | bash

in red lettering I got "This hardware is not supported, sorry!

so much for the explorerhat on a 3B+

Also, right after I tried installing the explorerhat the first time, the WiFi on the RaspberryPI stopped working.

Pimoroni’s installers are written for the official OS, Raspbian. Its what most people will be using.
You running Ubuntu MATE is likely your big issue and the reason for most if not all of those error messages.