The task you are trying to do can't be completed because remote desktop service is currently busy

Also, if I let it go and Try to connect again, it will work, but disconnect the 7th server. Then I try to connect the 7th server, it will work and disconnect the 8th server.

Hi,
This is an issue with the 32 bit limitation:

http://help.remotedesktopmanager.com/troubleshooting_memoryperformance.htm

We have few solutions in the help topic.

Thank you! That article made perfect sense. It's a perfect fit for me as we only plan on using RDP and SSH at best.

But I'm having troubles finding the 64 bit installer on the website. Would you please direct me?

Tell me if I'm doing the right thing:

I go to the main page and download the .ZIP version. I unpack it and run RemoteDesktopManager64.exe

It launches. I connect to the Devolutions Server.

I try to launch my 8 instances and same issue occurs.

I see on the bottom right that it is indeed "ENTERPRISE EDITION 10.6.0.0 64-BIT"

Any further ideas?

You have done the right thing but it seems that it was not related to the memory. Could you verify if you get anything in the application logs located in Help->View Application Logs