Are you on pc? Beta is only available for pc.

EDIT: Open up PT and click update. There is no more beta because it has been promoted from beta stage.

Whats beta i know where it is its on the page for downloading tpt.But when i downloaded it it was a future version of tpt it was version 46 something wtf is beta?

it is taken off the page when it is updated from beta
hang on a sec.
v46 beta 1
https://powdertoy.co.uk/Download/Older/powder-46.1b-win32.zip
v46 beta 2
https://powdertoy.co.uk/Download/Older/powder-46.2b-win32.zip

thar u go

i dont understand your problem so wtf.

After alpha, before Gamma.

46.3 is not beta, you use it. 46.3 > Beta