Download 64-bit Version of ADE 4.5?

My public library has both Overdrive and 3M Cloudlibrary.  The Cloudlibrary app requires the most recent version of ADE.  However, it crashes when I try to fulfill an .acsm file.  When I was trying to close ADE through task manager, I noticed that it was 32 bit, but my laptop is 64 bit.  To work around this, I have to deauthorize ADE 4.5, then reauthorize 3.0.  I don't like having to use multiple versions to accomplish something so simple.  I was thinking because it is a 32 bit program that is why it isn't working with my computer.  Does anyone know if there is a way to download a 64 bit version of ADE 4.5?