Downloading and using a Windows Server ISO from unofficial sources like the one you mentioned (October 2013 build) is extremely risky and not recommended . These files are often modified by third parties to bypass licensing, which creates significant security and legal vulnerabilities. Security Risks of Pre-Activated ISOs
The exploit responsible for the devastating WannaCry and NotPetya ransomware attacks. windows server 2008 r2 sp1 preactivated enus oct 2013 better