If you buy a new iMac, unless it has been on the shelf a while, it will likely be already loaded with El Capitan (especially if buying 10). CS3 is already 3 versions behind (4 if you include the current Creative Cloud subscription version) and as such will likely be problematic.

It sounds like you are in some form of production environment and as such, the new subscription model might suit you as it will be a lower cost to upgrade and should be able to be added as a basic office expense as opposed to a purchased version (expensive) which usually requires a multitude of signatures, a blessing from the Pope, and an act of God. The smaller subscription payments are usually more palatable to the bean counters. Very likely not, but it if is possible the most likely procedure would be to install Java SE6 before attempting to install Creative Suite if it does not work I would not expect Adobe to come to anyone's rescue, they're busy trying push Cloud out to all legacy users, and while I finally got Ps Ai and Id to work (CC2015) in 10.11 my acrobat is boned and an Adobe sr. Tech wants me to buy a new HD because 'there may be a compatibility with another application or file on another partition' so yay adobe, this is what $30 a month buys you. Probably trying and install El Cap is the best way to solve the problem and know the truth, but, as a reply to all of you, I must say I work in a school and there is not much money available, and that is the reason why we're trying to find an arrangement that suits everyone. Top rated financial software for mac.

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So that is also why we'd like to stick to CS3, for buying a CS6 or paying a CC license would be enormously expensive for a school, despite Adobe education packages offers. @ I'm not sure what you talking about when you speak of 'the new subscription model'. If you mean the CC subscription model, it would be enormously expensive for a school with hundreds of users (students) to pay for monthly access.

@ sorry but my english is not good enough to let me understan what you meant by: 'while I finally got Ps Ai and Id to work (CC2015) in 10.11 my acrobat is boned and an Adobe sr. Tech wants me to buy a new HD because 'there may be a compatibility with another application or file on another partition' so yay adobe, this is what $30 a month buys you.' Anyway thanks to everyone trying to help. I had issues with 10.11 and all of the Creative Cloud 2015 suite. Hopefully your iMacs are not too old and unable to install El Capitan. You may want to install it to an external disc, or a different partition on the internal, this will preserve the Snow Leopard installation, should anything go wrong.

Lets hope it doesn't. Once El Capitan has downloaded, it will ask you if you want to go ahead with the Installation, at this point say no and quit the installer application. Look in your application folder for the Install OS X El Capitan app, make a copy of this on a USB stick or another part of the iMacs disc, and keep for later use. If you are happy with El Capitan you can use this to install on your other iMacs, instead of having to use the App Store. In order for PS3 to work you will need to download and install the legacy Java installer from here.