Your security software mistakenly flags the file as a threat and quarantines it.
This is the most frequent cause of the error. Your antivirus, particularly Windows Defender, may have removed the file.
When Windows shows a "The program can't start because steam_api64.dll is missing" error, the game immediately crashes to the desktop. How to Fix the WWE 2K15 steam_api64.dll Missing Error
This is the only "official" method recommended by Steam and 2K Support. Do not download DLL files from the internet. steamapi64dll missing wwe 2k15 link
Are you playing a or a repack/disc version?
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Download the steam_api64.dll (64-bit version) from the link above. Extract the file. Copy the steam_api64.dll file. Your security software mistakenly flags the file as
Check your Antivirus Quarantine: If you find steamapi64.dll there, restore it and add the WWE 2K15 folder to your "Exclusions" or "Exceptions" list.
This problem is rarely random and is most often caused by:
Depending on the source of your game (Steam License vs. Third-Party Install), use the following methods to fix the error safely. When Windows shows a "The program can't start
Download the latest packages from Microsoft. Install both the x86 and x64 versions. Restart your PC and launch the game. Safety Warning About Download Links
: Because this file interacts with system processes to verify licenses, many antivirus programs (including Windows Defender) flag it as a "false positive" and quarantine it.