fix: FileDownload cross-platform support and target-path handling #121

Job	Run time
Continuous Integration / Run Linters	26s
Continuous Integration / Run Tests (PowerShell 5.1)	3m 14s
Continuous Integration / Run Tests (windows-latest)	1m 26s
Continuous Integration / Run Tests (ubuntu-latest)	1m 3s
Continuous Integration / Run Tests (macOS-latest)	43s
Continuous Integration / Publish Unit Tests Results	15s
	7m 7s

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