For anyone in the future who would still like to download monailabel through anaconda, this error (OMP: Error #15: Initializing libiomp5md.dll, but found libiomp5md.dll already initialized.) is essentially caused by multiple libiomp5md.dll files. The simplest solution that I found was to delete the older libiomp5md.dll file in the anaconda directory. After that everything should run smoothly. Path to the file is C:\Users\username\Anaconda3\Library\bin or C:\Users\username\Anaconda3\envs\your_env_name\Library\bin\ if you are in an env.
Others solutions are discussed here if you would like to try them instead
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