Im not sure if this is a bug, when i try to download Unreal Engine 5.0.2 it shows 123gb
is required 
is there any way to download for low size in Youtube they said its only 20-30 gb
When you install the engine underneath the folder the engine will be installed in there is a button called options. You can uncheck the parts you don’t need. If you are developing on Windows and don’t plan to support other platforms you can uncheck support for Linux, MacOS. etc. This will significantly cut down on the file size.
Example here for UE4.27 but the process is the exact same for UE5
Try uninstalling Epic games launcher, Download it and Install it again. It works for me! I hope it works for you.
i tried this and its still showing 123gb , what was the size of your engine ?
Hmm I had the same problem with the UE 5.0.2 Installation via the Launcher. It seems the disk usage calculation is buggy. If you only pick the mandatory core components under Options, it displays as zero. But if you, say, pick the Engine Sources (smallest optional install) as well it seems to calculate a proper value and then the Installer starts. At the moment the installer still is running, but i will report back whether it works, after it finished.
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This fixed it for me, thanks <3