Apologies if this has come up in my absence but using the new (to me) download routines with ISOFIT I am able to get SRTMnet without any issue but when I do isofit download sixs following the installation instructions I get a NameError: NameError: name 'validate_' is not defined. I can reassign the path to a previously build version of 6S or re-install following the advanced instructions as I did in the past but thought I would flag this issue as it seems like great functionality to have access to.