1. Download an Edge Code build (or Brackets, presumably) on a Windows Vista machine
2. Run the installer

Result: nothing happens

Expected: installer UI appears

Workarounds:

• Right-click > Properties > Unblock. Then run it again.
• Move the MSI file to a non-NTFS drive, then run it. (The "downloaded from Internet" tainting metadata is NTFS-only).

I tested on Vista Enterprise edition with default UAC settings, using IE 8. It's possible that other similar setups (e.g. Vista Home or download using Chrome) would not reproduce this.

This was reported by an Edge Code user in the wild here: https://forums.adobe.com/message/4893231#4893231

This appears to be a problem that afflicts other MSI-based installers. For example:

• https://mdn.morovia.com/kb/install-msi-File-requires-System-Admin-Privileges-Windows-Vista-10602.html
• Edge Inspect has the same problem: https://forums.adobe.com/thread/1093268#4848316 (although their installer codebase is almost identical to ours, so that might not prove much)

But given the sparsity of Google hits, it seems unlikely that all MSIs are afflicted by this. It does appear that some installers are able to detect this situation and show UI, but it's not clear if they're MSIs:

• https://kb.winzip.com/kb/entry/241/
• https://flippingbook.com/help/publisher-2/faq/installation-on-windows-vista-is-interrupted/