01. Obtaining DSDPlus - General-Disarray/Setting-Up-DSDPlus-Fastlane GitHub Wiki
I highly recommend that before starting, users should purchase the paid DSD+ Fastlane edition. The free version has not been updated since 2015. You can obtain both versions from here: https://www.dsdplus.com/
I am assuming that you have already installed and configured your SDR of choice. I use RTL-SDR, so any references to SDR refer to these.
Once you have your download, unzip it to your working folder - e.g. C:\radio\DSDPlus
For the paid version, you will need the password that is emailed to you. Keep this safe, as you will need to enter this password each time you receive an update.