In case you ever need previous versions, you have installed
look in your c:\Users\"your username"\LwSoft folder in that folder is a Download folder and within it are the versions you have downloaded- I found all the versions I have installed or Updated in that folder
That is were I found the last 20+ or so full install versions for SDC I have done via upgrades
You can open that folder and do a reinstall of the version you need
You could also copy the version(s) you have to say USB drive and install on another machine as well
As far as I am aware of, if you have registered version of SDC you can still use the Built in Update check for new or Beta versions as I believe that goes to a different server and as of this message, I am pretty sure that version 15.2401 is the most current
Hopefully this helps those looking to re install or possibly install to another machine