If you are getting an error that says something like this:
You are probably either using a browser that has an ad blocker enabled or an antivirus program that is causing the problem. In the case of an ad blocking browser could either be a browser that has builtin ad blocking like Brave or it could be an ad blocking extension that you added. Ad blockers tend to remove the "referred-by" field, but because of the way our downloads are configured you will not be able to access the files until you disable the ad blocking. Similarly, if you have an antivirus program that removed the "referred-by" field you will see this problem. In this case you will need to disable the antivirus program while you are downloading your music (don't forget to turn it back on when you're done).
If you don't completely disable the ad blocker and only want to add our site to the unprotected sites list you want to add the domain "products-sheetmusicnow.s3.amazonaws.com" to the list.
If you have a problem after doing this, please be sure to include the name of your ad blocker and any anti-virus software you are using in a message to our help desk.
Here's an example of how you would do that with DuckDuckGo on Chrome.
Popup your DuckDuckGo console:
Click on the "Unprotected sites" link:
Click on the "Add unprotected site" link on the new page:
Add the domain "products-sheetmusicnow.s3.amazonaws.com" to your unprotected sites list by adding it to the text box and clicking on Add: