It might work with other PocketBook devices/software versions. Please tell me if it works for you (and do make a backup of the explorer-3.db file before trying!).
Just copy the executable file into the PocketBook's application directory. If you encounter duplicate authors or other issues (see "Features" above) in the PocketBook's library, open the applications screen and tap on the PbDbFixer icon.
If you don't see any changes:
There might be an explorer (which shows your library) process already running Then you should just stop/kill it with the task manager. Putting the device to sleep and then wake it up might also work. Afterwards, the changes should be visible to the explorer.
If you want to build PbDbFixer yourself, you have to have the cross compiler for ARM CPUs installed. On Arch Linux, the AUR package `arm-linux-gnueabi-gcc75-linaro-bin` does the job. Don't forget to tell `cargo` which compiler/linker it has to invoke. In my case, I had to edit `~/.cargo/config`:
