I'm trying to get a watermark image like here:
How to add a watermark image on rmarkdown?
I almost did it, but as I wrote on my original question the
C:\Program Files (x86)\MiKTeX 2.9\tex\plain\present
I just did it.
The problem were on MiKTeX for Windows.
I just followed the steps on this answer, remembering to assure that the folder is TDS-compliant (with a
tex folder in it), and after I just put the image on the