The font, as you can see from above is Tinos which is OpenSource so you can download it freely from the Internet. Now, despite the fontspec warning, greek text is correctly displayed, the only apparent flaw is that when I right click on the source file>Go to pdf, the underlining does not match the text, I mean it's not centred on the text, actually it's moved to the center-left.
I can't attach the source file (*.tex) because they tell me
The file is too big, maximum allowed size is 256 KiB.
Sorry for that.
Last thing: I installed all packages of TeXLive, so it can't be that something is just missing.