When I finish the installation process flash player appears in my apps, but nowhere in my files/ start menu/ desktop etc
Urgent, need it for work. Have enabled flash on chrome so that is fine, but it is saying flash is not installed.
But after installing it still says it is not installed when I go to a flash website, or say that the plugin is blocked when I have made sure the settings don't block the website
That is the browser blocking the plugin, not Flash Player. Refer to the previous link I posted for troubleshooting steps from Google.
Also, Google embeds Flash Player in Chrome. There is no need to install the plugin manually. Just need to enable it.
Google's Site Engagement Index feature may also be preventing the plugin from loading, see Site Engagement - The Chromium Projects
if you continue to experience issues with it, see Google's Chrome support page (Google Chrome Help), file a bug with Chrome (Bug Life Cycle and Reporting Guidelines - The Chromium Projects), or use a different browser, but note that essentially all browsers are making it difficult for users to view Flash content by disabling Flash by default and forcing users to enable it, in some cases, for each site they visit (Microsoft Edge).