The recommended method to install File Reader, is simply using your target website marketplace page. However, if you wish not to use concrete5 internal feature, you can follow the next instructions:
Visit the page you want to show your file content, go in edit mode, add the block File Reader and configure the parameters accordingly:
If a file content does break the content of your site, (because it contains some harmful characters breaking the DOM structure), you can still recover by disabling all file render blocks:
Visit the > > > page, and turn off all blocks. Finally go to the offending page, edit it and change the target file (or just disable it)
This addon is a free addon, and does not come with free support. If you have a problem, just post a support request, we will reply when we have some time to do so.