Flash Player is no longer supported on mobile devices. You can, however, manually install the previously released Flash Player for Android following the instructions here, How do I manually install Flash Player on my Android device?. Since Flash Player is no longer supported on mobile devices, there is no guarantee that it'll work on your current OS and device.
I have successfully installed Flash Player on All Winner Android 4.4.2 100.1" Tablet. You have to use the following link to Archive Flash Player Archived Flash Player versions and download Flash Player 11.1 for Android 4.0 (18.104.22.168). It has to be used in conjunction with UC Browser, Dolphin Browser, Boat Browser or any other which supports Flash player & make some changes to settings. It worked for me.
Has any one made it to work on Dell Venue 7" I shall be interested to know.