Unreal engine can't build 64bit version in shipping mode

Development Platform & Builds
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1

Hi,
How can I build 64bit version in shipping mode? Cause this option is gray out.
The Code based editor can build, but downloaded from the launcher can’t.

2

Ofcorse it can’t, because he already have engine bineries build and it cant magicly turn those bineries to shipping build, you can do that only from source. But i think inclusion of shipping bineries to laucher sounds like a interesting idea.

3

So, what is the difference between shipping mode and development mode?