why dont i have the option to get some games

More likely, the game is: (1) Not yet released; pre-register should replace the download button. (2) Not available on this app; a link to the app store that does carry the app usually replaces the download button. In some cases, that app store does restrict games to specific areas. (3) Not an Android/iPhone game - whichever you have. Taptap now also covers PC and console games, as well. Where possible, they replace the download button with a link to the game's Steam page. And if you think that's irritating, just wait until you download games that haven't worked for 10 years on taptap. Or maybe there's a page for a beta that is long expired, and who knows what's happened to it. Taptap is not super functional.