ARD screen sharing not working in Snow Leopard Lab

I have a lab of 24 “education” imacs in commercial art lab and another 12 -27” imacs in a video production lab on a LAN
They are running OSX 10.6.8 and Adobe apps such as Illustrator, InDesign and Premiere
I had been using Remote Desktop 3.5 screen sharing to demo software to students at their workstations.
I updated to Lion over the summer and found it to be a total train wreck in my lab so I reverted the lab back to Snow Leopard.
However I no longer have the dmg file to reinstall ARD 3.5.
The only thing on the App store is 3.6 which does not work for screen sharing to the lab machines.
I can observe them, shut them down, I can control one at a time, I can even share my screen to ONE workstation at a time.
So right now I have NO WAY to demo software to my students through screen sharing AT ALL!
I put Lion on just the Admin computer and downloaded 3.6 and I can observe the lab machines, I can shut them down, but I can’t share a screen!
I’m told by Apple that there is NO WAY to get a copy of screen sharing software that will actually work in my lab.
I'm thinking all I would require is a copy of the ARD 3.5.1 dmg file but I can't find a place to download it.
Any advice would be greatly appreciated.

what a pain, buying old software to fix the new software. Here is what I'm working on to work around it for now.
So far in small scale its worked perfectly.
Here is what I'm trying to setup (hopefully it doesn't confuse the teacher or student too much):
1. Install Vine Server 4.01 on the teacher's computer.
2. Setup Vine Server to allow multiple connections, and disable Keyboard, Mouse, and Clipboard input from incoming connections.
3. Turn on the Vine Server.
4. Create a desktop shortcut to use Apples VNC Client with the IP address of the Teacher's computer.
5. When student's click on this they will connect to the teacher's screen but not be able to control, only observe.
6. Teacher can disable the Student's access simply by turning the Vine Server back off.
So far in small scale with 5 computers its worked well (Better than ARD at least!). Not sure how its going to do with a class of 27 computers. We DO have gigabit ethernet.

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Message was edited by: Meg The Dog

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