Would it be possible for you to please share any screenshots or URL's that you are attempting to download FP from. Any file name , configuration details will help also.
There is a box that you have to check.
The box is hard to see.
If I remember correctly, it is located on the left side under the read license area.
Hope this helps.
This morning we resolved a problem that prevented Flash Player installations from completing for some of our Macintosh users.
If you encountered this problem, please delete any previously downloaded Flash Player installer and either:
1.) Download the installer again from https://get.adobe.com/flashplayer
2.) Download the stand-alone installer from http://fpdownload.macromedia.com/pub/flashplayer/latest/help/install_flash_player_osx.dmg