If you are converting from Moneydance 2012 or 2014, please follow the instructions here.
Install Moneydance 2015
First, download and install the appropriate version of Moneydance for your system from here.
Converting your data to the Moneydance 2015 file format
Open Moneydance 2015. You will now see the "Welcome to Moneydance" window.
Click on "Import new account set" and open your yourfilename.md data file to convert your data file to the new Moneydance 2015 format. To keep your data file stored in it’s current location select “Convert Only,” to have Moneydance move your data file into the internal library select “Convert and Import. Please note, Moneydance 2015 data files use a new format and cannot be opened using earlier versions of Moneydance.
Register Moneydance 2015
You can purchase an upgrade to Moneydance 2015 for $24.99 by entering your current license key here. If you no longer have your key, you can retrieve it using the key finder tool on our purchase page. Once you’ve purchased a key you can enter it in Moneydance 2015 by going to Help->Register Moneydance.
Update your extensions
Moneydance 2015 uses a new extension format. To update your currently installed extensions to the 2015 format go to Extensions->Manage Extensions and click the “Update All” button at the lower left of the window. You can find more details on Extensions in Moneydance 2015 here.