Fix download of file when the evaluation path contains a subdir

[FedericoNegri]

Description

As reported by Yan (Ansys Forming): downloading a file with evaluation path containing a sub directory (like B-05\B-05.d3plot) was failing. Fixed by properly creating the target directory.

Checklist

Please complete the following checklist before submitting your pull request:

• I have tested these changes locally and verified that they work as intended.
• I have updated any documentation as needed to reflect these changes (if appropriate)
• I have verified that these changes to the best of my knowledge do not introduce any security vulnerabilities.
• Unit tests have been added (if appropriate)
• Test-cases have been added (if appropriate)
• Testing instructions have been added (if appropriate)