There are (for me at least) a few issues with Mint 19 Cinnamon.

I had a problem on my 64bit laptop where some apps would not launch & I had to install cairo-dock-gnome-integration-plug-in via the terminal, that worked & I didn't think much more about it until I did a fresh install of Mint 19 on my 32bit desktop, this time I had a few issues with Cairo-Dock so much so that I had to remove it, sadly I haven't yet found a suitable alternative.
Then more problems, I use an online backup app called Megasync which upgraded perfectly on my laptop but as I did a fresh install on the desktop I had to reinstall it, but it failed due to missing dependencies (can't remember which offhand) but when I re checked the Mega website Mint was only available up to version 18, there was an Ubunto 18.04 but it was 64bit only.

There may be other issues to come yet but I think the move from 16.04 to 18.04 may be something that means it will be a while until everything is ironed out.

Mint 19 actually says don't upgrade unless you've a good reason to do so...
Actually you don't have a choice unless you are happy to run very old versions of some major software.

I always:-
1. Wait a couple of weeks to allow things to settle & monitor problems that others have.
2. Create a VM of the old version of the distro, with any special packages installed.
3. Download a live version of the new distro & give it a quick test
4. Go through the upgrade process in the VM - it takes a long time!
5. Check out the new VM Mint - if all is OK you can then consider an upgrade on your actual machine.

I understand that Ubuntu is dumping a lot of 32 bit stuff & going for 64 bit only.

Actually, if go to https://mega.nz/sync
I get this:-

Which looks promising for 32 bit.

Yeah thanks, the link you posted is where I went to download Mega but the 32 bit button only gives an option (for Mint) up to version 18, there's an Ubuntu 18.04 option but that's only 64 bit.

My laptop is working fine after the initial problem but in the case of my desktop I plan to back up & reinstall 18.3 on that machine.

I did use a live disc (19) for a while on the laptop & all was ok but I didn't do it on the desktop (my mistake), a lesson learned there.

The issue isn't with Mint 19. If MEGA doesn't provide 32-bit versions of their MEGAsync application for Ubuntu 18.04 or indeed any versions for Mint 19 (although the Ubuntu 18.04 version should do the trick, if available), then that is entirely down to MEGA. You should contact their support guys and ask them what's up.

If Ubuntu don't provide the appropriate 32 bit libraries, it makes it hard work for Mega and anyone else.

I have just checked and every one of the dependencies required for MEGAsync's Ubuntu 18.04 package is available in both amd64 and i386 versions in Ubuntu's repos. This is as I would have expected - i386 is still a supported architecture of Ubuntu. You can check this through https://packages.ubuntu.com/.

The decision not to produce an i386 version of MEGAsync appears to be the decision of MEGA themselves. They have probably decided that it is too much effort in comparison to the number of i386 installations using MEGAsync. As I said, the OP should contact MEGA directly and ask them why.

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I have sent an email to Mega on this subject & await their reply, in the meantime I am having no issues with Mint 19 on my 64 bit laptop (and long may that continue) but for peace of mind I have reinstalled 18.3 on the 32 bit desktop. 18.3 is supported until April 2023 & as previously mentioned if there is no valid reason to upgrade you shouldn't.
Thanks for all the comments.

Great. I will be interested to see what they say.

Just for info, Mint 18.x is supported until April 2021, not 2023.

https://linuxmint.com/download_all.php

Yep 2021 my mistake. I will post the reply from Mega

Mega have replied, they say the correct file to download is the Ubuntu 18.04 however they warn that there is no 32 bit support.

Thanks for letting us know. If I were in your position, I would ask them why they had decided not to support 32-bit systems and point out that there are still many such systems in use.

To be fair I am aware that many software & hardware developers are dropping support for 32 bit so I'm not really surprised. I have reinstalled Mint 18.3 on my desktop & all is working fine so I'm not too bothered & with 18.3 being supported until 2021 by then I may decide to replace the system.

Fair enough. I was just going by the "squeaky wheels" theory. One tactic employed by a software developer may be to not immediately produce a 32-bit version of their software and wait to see what levels of complaints they get. If there are minimal complaints, they will then not proceed with producing that version. If there are numerous complaints, they will produce the 32-bit version, knowing that the demand is still there. They're the guys who therefore need to know. However, if you're happy with running 18.3 then all is good.

I do see your point but I'm happy to continue using 18.3 for a while. the system is getting on & by the time we get to 2021 it will need replacing so I'm happy to not worry too much about it but yes valid point.
Thanks.