You may need to install the "Download" app from the Google Play Store. You may also need "File Expert" or "My Files" to find the files in the Download folder.
To extract the zip files of our compilations, you may need to get the "AndroZip" app.
On my Android phone, I find that downloading using the Firefox app is more reliable than using the built-in "Web" app.
These apps are all free in the Google Play Store.
There is an app called "GoodReader" in the Apple App Store that reportedly enable you to download files from websites like ours. It costs 99 cents.
Another app called "MP3 Music Downloader" is offered for free.