Flash plugin is not available on iOS devices, so UVG play videos with HTMl 5 <VIDEO> or <AUDIO> tag when you use an iOS device. for other devices UVG assume Flash plugin is available and it instructs you to install Flash plugion when Flash is not available.
An important change in UVG 5.1 is that, UVG now gives you a way to watch videos by HTML 5 <VIDEO> and <AUDIO> tag when Flash plugin is not actually installed on your computer or device.
Some cultures, like Spanish & Germany, use "," as decimal point instead of ".", we noticed this this slight difference may make you not able to pass UVG 5 permission check, this problem is also fixed in UVG 5.1.