Cannot install Shell extension because already installed

[ohrenkino]

Could it be that you installed a 64-bit version over an existing 32-bit version?

See here for additional notes on installing the 64-bit version

Notes on the 64-bit version of Mp3tag

I've released a 64-bit version of Mp3tag a few days ago and received a few questions about differences between the 32-bit version and the 64-bit version. To make it short, there should not be any noticeable differences except for two things: The 64-bit version uses 64-bits to address memory and is no longer limited to 2 GB per application. While the Library feature of Mp3tag is already a very viable solution for large libraries, loosening the memory restriction is one of the key benefits of …