For Adobe Flash Player go to https://get.adobe.com/flashplayer/ . Uncheck the boxes for Optional Offers before download.
For Adobe Shockwave Player go to https://get.adobe.com/shockwave/ . Uncheck the boxes for Optional Offers before download.
Verify your Java is installed and up to date at https://www.java.com/en/download/installed.jsp
Tip: Use a Secondary Browser for Flash, Java and Other Plugins: https://www.ghacks.net/2016/04/28/tip-use-a-secondary-browser-for-java-flash-and-other-plugins/