Yes, multiple versions of SigmaStudio can be installed on a PC at the same time. You can have one installation each of versions 2.9, 3.0, and 3.1. You cannot, however, have multiple copies of one version installed. This means, for example, that you cannot have both versions 3.1.3 and 3.1.9 installed simultaneously.
A user may want to have multiple versions installed to be able to support released products or to enable a software design freeze on a project. Of course, we recommend that any new designs are always started with the latest version of SigmaStudio. New features are always being added, and bugs are being fixed, so the latest version will always be the best with which to start a new SigmaStudio project.
This FAQ was generated from the following thread: Install multiple versions of SigmaStudio