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It should then hopefully do the install of Windows 10, after it has completed you can re-run Boot Camp Assistant and create another USB memory stick with the Boot Camp drivers on it, this can probably be USB3 since you will not be booting from it. You will then boot from the USB2 stick and tell it to install on to the Windows partition, it will need to reformat it from FAT32 to NTFS, make sure you select the correct partition, you can do this by looking at the size of the partition and picking the one that matches the size you created.You will then use Boot Camp Assistant to copy the ISO image on to the USB2 memory stick and make it bootable.You will use Boot Camp Assistant to create a Windows partition.You will need an 8GB or bigger USB2 memory stick, it must not be a USB3 stick.You will need to download the ISO image of Windows 10 from here.You therefore may need to first prepare a drive using an older version of OS X with a correspondingly older version of Boot Camp Assistant, your 10.7.5 aka Lion is if anything too old, I would try 10.10.5 aka Yosemite. I am guessing Apple changed the rules with the latest Boot Camp Assistant. However according to the current official Apple Boot Camp article here Use Windows 10 on your Mac with Boot Camp - Apple Support this is not supported. As I have a Mac Pro 2010 and have successfully installed Windows 10 on it I can therefore confirm yes it is posibble. Since there have only been Mac Pro 2010, 20 models you probably have a 2010 model bought in 2011.
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