Fix assumption that download URLs contain file extension #3591

Job	Run time
Diagnostic export (ubuntu-latest, nightly-latest)	18s
Diagnostic export (ubuntu-latest, linked)	1m 5s
Diagnostic export (macos-latest, linked)	1m 18s
Diagnostic export (windows-latest, linked)	1m 46s
Diagnostic export (windows-latest, nightly-latest)	2m 42s
Diagnostic export (macos-latest, nightly-latest)	1m 16s
	8m 25s

Provide feedback