New versions of the Eclipse ESCET IDE can be used side-by-side older versions.
To download and install a new version of Eclipse ESCET IDE side-by-side an older version, follow these steps:
Download and extract the new version as usual, but extract the new version to a different directory than the old version.
You can copy the data (projects, files, and settings) of an earlier installation to the new installation. While neither version of the Eclipse ESCET IDE is running, simply remove the workspace directory of the new installation, and copy the workspace directory of the earlier installation to the new installation.
Using these instructions, it is possible to use multiple installations side by side, at the same time, regardless of whether the installations are the same version or different versions. Simply extract them to different directories and launch them as you would normally do.