In this time the best way, avaiable for uses a C64 its 64HDD using with a Cable XE1541 . Anyway if you want transfer .D64 images and T64 images, you will need a XE1541 cable and any software like Star Comander..
In this times are very hard obtain a 5 1/4 disks .. then i think the best thing you can do its uses 64HDD with any PC in DOS mode..
regards
