We’ve pushed a full installer version containing DS 2.3.1 version (other software will be downloaded only if you select them, which is not necessary):
updatesite.sierrawireless.com/in … v2-3-1.exe
To recover your packages: you don’t need to reinstall them, just copy the spm.properties file from the <2.2.1 install>\configuration directory to the <2.3.1 install>\configuration one.
To recover your projects: you could reuse the same workspace, but to keep a backup copy, it is recommended to start a new one, and import your projects (File > Import > General > Existing projects into workspace) from the old one.