Unfortunately, there's no 64-bit version of TE2013, as it uses an old engine that doesn't support 64 bits.
You can either :
- try to downgrade your MacOS version (I don't know if it's possible)
- install Windows and dual boot to it to play the Windows version of TE2013
2 solutions :
1 ) Right-click and select "Open". This may bring up the same dialog, but with an option to Open the file anyway.
2) You can get round this by removing the quarantine Extended Attribute on the file, within the terminal:
xattr -d com.apple.quarantine /path/to/file
== Mana Games ==
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