You need to rename folder "vispror.ww" to "vispro.ww". In the "vispro.ww" folder rename file "visprorww.cab" to "visproww.cab". Remove the files "config.xml", "visprorww.msi", "visprorww.xml" and "setup.xml". Then copy files from english vl dvd to your polish "vispro.ww" folder: config.xml ose.exe osetup.dll setup.xml visproww.exe visproww.xml visproww.msi Also, replace files "setup.dll", "setup.exe", "autorun.inf" in the main path by files "setup.dll", "setup.exe", "autorun.inf" from english VL dvd. You are done.
So if there is a difference of language I have to replace more than four files? I obviously renamed files and folders and replaced proper files. I haven't known about setup.dll & setup.exe replacing. I'm gonna check it soon.
Sorry for my answer, I tried yesterday with you pl version and this one is not supported. It seems channel switcher is off in this version. Perhaps the best way is to find Visio 2013 english vl and add PL language ?