Licence Aspose.PDF Text Extractor for .NET does not install

Hi, We just purchased a licence for Licence Aspose.PDF Text Extractor for .NET to use in .Net 4.8.1 application to extract text from pdf.
I just cannot set the licence. With license.SetLicense(licencepath); I get Index was outside the bounds of the array. I also tried Stream: same responce.
Also tried
Aspose.PDF.Metered metered = new Aspose.PDF.Metered();
metered.SetMeteredKey(“your-public-key”, “your-private-key”);

That just gives Authentication failed.

Do I still need to activate this key or something?

@CosoAspose

Please make sure to use the latest version of the API first. And are you still facing licensing related issues? Can you please response if issue still persists? We will further proceed to assist you accordingly.