Click the blue square with a white person in it from the bottom right of your screen.
If you do not see this you may have to launch it manually. You can find on the start menu under "SOLUS3 Agent"
If you see the below screen click "Deploy now". SIMS will then say "currently being installed on this machine". Once this window says "There are no Capita SIMS Software Updates to be installed" you can then open SIMS.
If you do not see the above box please click "Applications" along the top and then "Check for update"