Add download.sh file
s/Dowloading/Downloading/
Abort if errors are encountered
Small doc correction for USERPROFILE on Windows systems
Merge pull request #210 from zarko-tg/userprofile_fix_in_readme

Small doc correction for USERPROFILE on Windows systems
Merge pull request #175 from michaelsauter/feature/add-download-script

Add download.sh file
Don't error when failing to get certificates that may not be there