I have Apple Lossless to convert to FLAC

I have done an initial batch (50gb)

Only some tags and artwork came across so within an album some songs have the info some don't.

I selected delete original file after conversion but this did not work meaning I had to manually go in to each music folder, sort, then delete.

Is this because I have the free version? Is there someone who can advise as I have a lot more to convert?

Many thanks