If you need to run Flash files on your Mac device, you can follow the instructions in this guide. This particular guide is for some Mathematics department swf files, but this can apply to any old swf files that you find. Be careful of Flash files if you do not trust the source.
https://docs.google.com/document/d/16-QrbQz5F1mzEvmTdyN9LpOHEyQ0Trzm4FT8POjFuD8/edit