What do you mean??? Had you a look here? And I can add it's working fine with 77.0.201.0 on Windows 7.
The download doesn't specify architecture, so does Edge automatically use the correct version when installing (ie 32 or 64 bit)?
What kind of download are you talking about or what installation are you talking about? If you mean an online installer/updater, you will always get a 64-bit version if your system allows it.
As I said, if You use online installer, it will always install 64-bit if it is possible, if not 32-bit. If You uses full offline installer, You must select correct installer and this version will also installed.
A few days ago i talked about an issue i encountered with Edge Canary 77.0.197.1 This problem i now solved. But, same player shhots again, the problem is now present in Edge Dev 77.0.197.1! Waiting for 77.0.197.177.0.202.0.