BD Installer downloads files, then erases them?

Installing BD on a large group of systems. On a few of them, I've run into an odd issue.

The installer runs, and stage 1 (downloading files) works fine.

Normally, the files get downloaded into %temp% and then are executed from there.

On some systems, I've watched the folder and the files are downloaded, then immediately deleted and nothing else occurs.

No errors in the event viewer, no installer files in temp, etc.

I'm no coder, but this seems...not intended.