This is now somewhat away from original questioning about why Cups was not functioning on my 2010 but that is now perhaps academic.
I apologise for my impertinence and will consider myself suitably reprimanded for not having the foresight to regularly upgrade all my distros on a regular basis across 5 machines (on some of which I don't use linux on a regular basis).
Cups is not functioning on your system because you have not updated your system in a timely manner. This is the only correct answer to your question; it is not a reprimand, it is information.
The 2010 release is still supported, if it has been properly updated. Your 2010 release is not supported because you neglected to keep it updated in the proper manner, to the point where it no longer can be updated. This is also not a reprimand, just a statement of fact, and applies to any individual installed system that is neglected beyond the time where upgrade paths can be maintained.
The repository information shown in Synaptic reflects the fact that the current updates are still being applied to the 2010 release, which is the last true release of the 32 bit version.
To aid those installing PCLinuxOS for the first time, or those, such as yourself, who have lapsed on their timely updates, we offer new ISO images on a quarterly basis, more or less. These are not actually new releases, just the 2010 release, fully updated to the time of the image release date. This allows the user to start/restart at the current state of the 2010 repository, or at least close enough to the current state that updates are still possible.
All users are reminded that the first step, after logging in to their new installation, following the creation of their normal user's account, is to update the system. The further from the image release date one gets, the greater will be the number of packages needing to be updated. Once the initial update is completed, any additional applications one wishes to use, can be installed. This would include those packages needed to set up your specific printer, assuming it is supported in Linux, and not already installed by the initial installation process. They are also reminded that each time they wish to add additional applications, they need to update the system first, and that frequent updates are also required to maintain the system in proper working order, even if no new applications are needed.
When there is danger that the previous image may be approaching the point where it can no longer be updated, a new fully updated image is released. Depending on how many individual package upgrades have taken place during the time between releases, this could be less than quarterly, or possibly slightly longer. The updates themselves determine the actual timing of the next image release.
The important point is that to function properly PCLinuxOS must be updated frequently. If a user doesn't feel they need a system that is up to date, including applications as well as security updates, those users may be batter served by installing a different, static release, distribution.
Only you can decide which type system works best for you.