It wont allow me to install the unreal engine

I`ve recently downloaded UE4 but when I load the launcher it hasn’t installed the engine and wont give me any option to install it.

Could you put up an image of what your looking at Please?

Click ‘Library’ on the left.
Then, click the ‘+’ next to ‘ENGINE VERSIONS’
Select the Engine version from the drop down if you want to change to a different one and then, ‘Install’
For source built versions of Unreal, you will want to download Visual Studio and be sure to link your github account to UE4 account.