According to the FAQ, those who previously donated and are now seeing ads in the application should use the 'contact us' page to have this corrected:
I donated back when the project was DS4Windows or DS4Tool and now have ads again with the re-branding. Must I donate again?
A: Absolutely not, we said ads would be removed forever and we meant it, this is only the result of the server and site migration not taking all the account info properly. Just contact us through email here
making sure to include Paypal and IM account info and we will manually fix your account.