There's a downloader app https://play.google.com/store/apps/details?id=com.esaba.downloader
I use this one https://play.google.com/store/apps/details?id=flar2.homebutton&hl=en_US&referrer=utm_source%3Dgoogle%26utm_medium%3Dorganic%26utm_term%3Dbutton+remapper&pcampaignid=APPU_1_hfvkZqCRO5L00PEPndHYyQQ
Install a button remapper You can disable the buttons, or reuse them for custom actions :P
There's a downloader app https://play.google.com/store/apps/details?id=com.esaba.downloader