Should be no problems with an Android tablet.
1. Do you know whether other students are having problems? It may not be connected with your device.
2. Can you give me two examples of files you cannot download.
3. Please supply a url or give me the Moodle module code and describe where the links are on the page.
It could be a setting I can change for you.
The files in Topic 5 are all PDF's, so you may need some software to open them. You can get Adobe Reader for Android from here; http://www.adobe.com/uk/products/reader-mobile.html
Did you have any problems opening the Documents 'Assignment Brief' and 'Reading List'?