I'm running OS X Sierra with Sage 7.5.1 App version. TEXlive 2016 is installed. PDFLATEX runs from a terminal command. I've followed each step to get SAGETEX to see TEX and probably a few more. I still get: “Error: PDFLaTeX does not seem to be installed. Download it from ctan.org and try again.” I'm running out of things to try. Any assistance would be appreciated.