SDL XLIFF Split&Merge App 2015 + 2019 Error


I am trying to split an Xliff using the SDL XLIFF Split&Merge App, but am getting error messages both in 2015 and in 2019. 

The 2015 Error reads: ERROR: Method not found: 'Void Sdl.LanguagePlatform.Core.Wordlist.Load(System.IO.Stream)

The 2019 Error reads: Studio location could not be found. Please ensure Trados Studio is installed in order to split files!

For both Studio 2015 and 2019 I use the App, however I have tried running the Split&Merge App as a plugin integrated into Studio 2019 but I get the same error. 

Thanks in advance for any help!