Working over Powershell as admininstrator.
C:\letsencrypt\letsencrypt-win-simple
letsencrypt.exe --san --centralsslstore C:\Central_SSL
and add my domain to get certificate and send it to %SystemDrive%\inetpub\wwwroot
After that i got:
"Which host do you want to get a certificate for: m
Enter a host name: factorone.galileo.ba
Enter all Alternative Names seperated by a comma factorone.galileo.ba
Enter a site path (the web root of the host for http authentication): %SystemDrive%\inetpub\wwwroot
Authorizing Identifier factorone.galileo.ba Using Challenge Type http-01
Writing challenge answer to C:\inetpub\wwwroot.well-known/acme-challenge/PT8WD49TuMyvPvjzT3CmEEVPcTKZn7CaBmBCwoBxgJM
Answer should now be browsable at http://factorone.galileo.ba/.well-known/acme-challenge/PT8WD49TuMyvPvjzT3CmEEVPcTKZn7CaBmBCwoBxgJM
Submitting answer
Refreshing authorization
Authorization Result: invalid
The ACME server was probably unable to reach http://factorone.galileo.ba/.well-known/acme-challenge/PT8WD49TuMyvPvjzT3CmEEVPcTKZn7CaBmBCwoBxgJM
Check in a browser to see if the answer file is being served correctly.