Do not download multiple times

[jhaals]

Fixes #811

[codecov]

Codecov Report

Merging #812 (25cd97e) into master (0f21823) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #812   +/-   ##
=======================================
  Coverage   78.57%   78.57%           
=======================================
  Files           6        6           
  Lines         350      350           
=======================================
  Hits          275      275           
  Misses         49       49           
  Partials       26       26           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c12ca35...25cd97e. Read the comment docs.