Thank you for reporting the issue and I am very sorry about the issue!
In theory, without running any installer, it is very difficult for the installer to do any harm to your computer. Once I had this issue with my own computer, it turned out that the drive was corrupted badly, and any operation with Explorer would result in a crash. This could be an early sign, so I suggest doing a drive checking before it's too late.
Let me know if this helps with the issue!
Thank you very much!
I managed to reopen my Download folder after deleted the Archicad 24 installer using networking shared folder method. Although I didn't use the PowerShell command line method but I believe my problem is very similar to what has been described in the website.
Definitely the issue is not due to the incomplete download file. As I tested a new Archicad installer (in pendrive) with my second computer (Windows 7) and I can open the folder and installer without problem. But my first computer (Windows 10) closes the file explorer immediately as soon as I browse the folder with Archicad installer saved inside.