Make sure they also support it on your plan, I know freedom likes to cut corners in certain places. You might want to call them though. If they do support it get them to reprovision it. Make sure you mention Wi-Fi calling.
As B.Diddy says a web app might work, that of course depends on whether or not you can find a browser that would work with kitcat.
You could try XDA developers someone there might be working on a more modern OS for that but I wouldn't hold my breath.
The phone is doing exactly what it is supposed to. You need the password and should never buy a used phone without it. This is in place to help prevent theft. This is built into all modern android phones.
No one here will help you bypass it, you may very well have purchased it legally but the...
If the files are very important maybe look into a data recovery service. Very expand no guarantee you'll get satisfactory results. Don't bother with online services or apps. Might as well write me a cheque.
You can try Reddit. Android central does not help others bypass security. Even if this is your friend's phone and he gave you permission to do this we have no way of knowing for sure. Sorry, maybe suggest a memory boosting app.
Motorola also makes a few interesting watches. Buyers seem happy with them based on reviews. I don't know if staying in the Moto ecosystem makes a difference or not. https://www.amazon.ca/Motorola-Moto-Watch-120-Smartwatch/dp/B0DBZZ89FL