Rekordbox 6 library migration failed, lack of disc space on D:?

Thanks for your help.

Windows 10 version 1903

Rekordbox 6.0 installed and initially worked fine.

Rekordbox 5.8.5 and Rekordbox 6.0 are both in the Pioneer folder in Programs on the C Drive.  Music library is 75GB, on C Drive, which has 248 GB free.

I tried to convert the library from 5 to 6 but this process failed due to lack of disc space on D Drive.

There is a folder on the D Drive called PIONEER, which contains a folder called Master, which contains various XML and .edb files.

Reallocating space from C: to D: is beyond my skill levels :(

All help welcome!