Never download steamapi64.dll from a random "DLL download" website. Those files often contain malware. You should only get this file from an official Steam installation or a trusted friend who has a working copy of Black Ops 3.
Sometimes, antivirus software can mistakenly flag Steam API files as malicious and quarantine or delete them. Temporarily disable your antivirus and try launching the game. Never download steamapi64
Many sites offering individual DLL downloads are untrustworthy and can lead to malware infections. Sometimes, antivirus software can mistakenly flag Steam API
It sounds like you’re referring to a blog post or guide about fixing the steam_api64.dll missing error in Black Ops 3 — and you want to know how to actually resolve it, based on what a verified or interesting post would cover. It sounds like you’re referring to a blog
Right-click on and select Properties . Go to the Installed Files (or Local Files) tab.