[#2108] do not download the same file again #2212
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Issue:
Download of a new signature file takes >15minutes so Exchange isn't able to download the files in our network. -> timeout
When Update-Engines.ps1 is run by a scheduled task every 15min it will re-download the current file and overwrite the existing. While the download is in progress the file cannot be used by Exchange and signature Update will fail.
Fix:
do not download the file again when it already exists and has the correct size