It works for me, so it’s most likely that the download got corrupted somehow.
Edit: Apologies! I misread the error message.
Your operating system is 32-bit and the updated runtime is 64-bit. According to messages in the Discord, the devs are aware of this issue and are looking into restoring compatibility. (There is a 32-bit version of the updated NW.js runtime that can be used.)
Might take a little while.