OllyDbg 2.01 is a total rewrite that runs on 64-bit versions of Windows, but it can only debug 32-bit applications (via the SysWOW64 layer).
While you can find an on the official OllyDbg website , it is not a fully functional tool for modern 64-bit debugging. Development on the project has been frozen since 2014, and the 64-bit "alpha" remains buggy and limited. The Reality of OllyDbg for 64-Bit ollydbg 64 bit free download
As of 2022, official development is considered frozen. Top Alternatives for 64-Bit Debugging OllyDbg 2
The spiritual successor. It features an interface nearly identical to OllyDbg but with full, native support for both 32-bit and 64-bit apps. ollydbg 64 bit free download
Microsoft's official debugger. It is extremely powerful for kernel and user-mode debugging on 64-bit systems.