Unbranded paper QTR profiles (9890 K7 Neutral + i1 Pro 3)

Hi everyone. I bought an unbranded paper Matte 300gsm, 100% cotton. I need to create the proper curve for my 9890/Neutral K7 printer.
I read the www.diallophotography.com/pdfs/QTRworkflow.pdf and the i1 Profiler Workflow for QuadToneRIP — Black and White Mastery tutorials but I’m stuck at the beginning because I can’t read the densities for the custom ink limits and crossovers.
Do anyone know, please, how to read the inkseparation8.tif with the i1profiler?
Or do anyone know any workaround?
Many thanks in advance.