I am trying to find out if your products run on RHEL 8? I was looking at pages like this, https://docs.aspose.com/display/pdfnet/System+Requirements and it looks like Ubuntu/Debian version numbers.
The Aspose.PDF for .NET supports .NET Core and it should be run in mentioned environment i.e. RHEL 8. However, please let us know in case you face any issue.