It is recommended that only a single Chart or LabChart application be loaded onto a single machine. However if it is desired that multiple versions of Chart / LabChart be installed, then there are not any major performance issues that would be encountered, however be wary of using older Chart applications on newer Operating Systems, and newer version of LabChart on older Operating Systems.
You may also need to make a specific LabChart version open as default. To do this, right click on a adicht file and go "Open With" --> "Choose another app". Find the labChart version you need and click "Always use this app to open .adicht files"
For further technical assistance with this or any other issue, please contact ADInstruments Technical Support by clicking HERE.