I have changed the folder from:
phocadownload
to
media/k2/attachments (without the / in the beginning)
and have added two files:
one for download: Filename: com_phocadownload_v1.3.2.zip
second for preview: Filename - Preview: phocapdf-demo.pdf
and now I am able to download the file and to preview it, I get:
http: // localhost/Joomla/media/k2/attachments/phocapdf-demo.pdf
the same with playing
SEO enabled/disabled
Jan