Hi Armando,
if you are referring to the XceedComponents.exe packages, you won't be able to install multiple version side by side. If you are referring to the Xceed_Ultimate_Suite_vX.Y.exe package, you will be able to install multiple version at the same time.
Please note that the ActiveX components, either installed by the XceedComponents.exe or by the Xceed_Ultimate_Suite_vX.Y.exe, won't install side by side. As explain before, unless making a completely new component, the way ActiveX are registered do not allow multiple instances to be registered at the same time.
Hope this help!
Jacques.
Jacques Bourque
Software Developer
Xceed Software Inc.