Hi sunegami. I'm sorry to hear about this. But I'm also sorry to say that unless you have a backup of those files already, we can't help you out. Bethesda/Steam aren't distributing those files any longer, so there's no legal way to get them.
Also, the nexus has a very strict anti-piracy policy so other than from Bethesda or their authorized vendors would be against the rules here.
Totally agree and sadly the only answer that is " too late " for you ... but moving forward:
Backup recent FO4.exe & the FO4ScriptExtender for it a backup directory.
I can tell you: Fallout4.exe that you are looking for is:
Fallout4.exe - 22.214.171.124 - 06/13/2019
I think you will be seriously challenged to find something from June of last year.