Oh, sorry to hear that. If development says it's not repairable, I don't think you can do anything about it. I would suggest to request the same file from architect who sent it. Maybe they can Open&Repair the file on their side, resave it with "save ...

Hi, A corrupt object or something interfering with downloading the file, there can be various reason why a file might be corrupt. From the attached picture I can see it still has a lot of information in it. It might be worth to check it's hex codes (...