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I'm using PlayOnLinux 4.0.14. I notice there's a new version 4.1.8. Do I need to uninstall the old version before installing the new? Also, should I install from the Software Center or by clicking on the upgrade file?

You don't need to uninstall anything.
Going the repository way is recommended, because it will keep updating PlayOnLinux as new versions get out; Also, it should prevent next system update from downgrading back to 4.0.14 ;)

I'm absolutely new to Ubuntu. Could you tell me what the repository way is? Thanks.

Download page here, click on Ubuntu, then type the commands for your release of Ubuntu in a terminal.

Edited by petch

I've learned how and where to add the command (example: 'deb http://archive.ubuntu.com/ubuntu precise main').

Could you give me the command to add PlayOnLinux to the repository?
Thanks,
Jim

Those commands are confusing--do I type it all in at once? DO each line separately, or what?

Hi, don't know if its still of interest for anybody.

I would put each line separated (besides the second, which is split). After doing so, you should find the new POL in Software Center - or it should have been updated already.
Hope i could help.

You can also just install the .deb file from there, as well. Doesnt that also install the repository automatically? It does the dependencies too.