On Kali Linux many things you’ll need to do yourself, as it’s an OS directed toward to the users desires. Installing Adobe Flash player is not a hard job, just download the plugin and copy it to the plugins folder.
Step 2: Using Terminal, extract the content from the archive:
tar zxvf adobe_filename_here.tar.gz
Step 3: Now, copy the libflashplayer.so file into your browser’s Plugins folder, for example:
cp libflashplayer.so /usr/lib/mozilla/plugins/
That’s all, now Adobe Flash Player errors wouldn’t bother you anymore.