how can update adobe flashplayer?

You can't. It's dead. Adobe halted all downloading of it from their web site about a month ago. Come the 21st of this month, it will no longer function anywhere.

Correction: Not the 21st. It's tomorrow, the 12th when Adobe's kill switch goes into effect.

For whatever its worth, you really should not need Flash for anything anymore.

Moist if not all websites that used flash have moved away from it onto newer and more secure options.

Also note, that the imminent death of Flash, does not in any way affect Adobe's other products such as Acrobat, Photoshop, Lightroom etc...