To reinstall SharedPlan simply go to our download page at: http://www.sharedplan.com/download.html and download and install SharedPlan again.

More than likely you will not have to register it again, but you might want to verify that it is registered by selecting: SharedPlan Pro -> About SharedPlan Pro if you have a Mac, or Help -> About SharedPlan Pro on other platforms. The license number should be displayed in the pop-up window.

If it is not registered, select Help -> Register SharedPlan.  A registration window will be open where you can type your license number.