Do not be deceived, if you are in Nigeria or a fun of bet9ja, the bet9ja old mobile was faded out by Bet9ja. This in a simply term means there is no way to download neither to get bet9ja old mobile.
What you have to do is to adopt the usage of the new Bet9ja mobile because the old version is not available for download on play store or other app stores.
The official website of bet9ja is sport.bet9ja.com