Yes, it can be done easily. The 1.6 instructions are meant to indicate that you can upgrade from 1.6 -> 1.10 directly, however, it's better to do each one in turn really. 1.6 -> 1.7, then 1.7 -> 1.8, then 1.8 -> 1.9, then 1.9 -> 1.10.1You're already on the last step, so, just make a backup of data and files, then upgrade the files and visit the admin interface. PHP: You'll need at least 5.6