[AT&T HTC One (M8)] DG4FREE:
I did want to mention that when trying to flash the RUU, I did get a second "error" after the listed first one. I've attached the code from ADB below.

Daniels-iMac:~ Daniel$ fastboot flash zip /Users/Daniel/Downloads/RUU-HTC_One_M8_GE-1.16.1700.16.zip
target reported max download size of 1830715392 bytes
sending 'zip' (510598 KB)...
OKAY [ 20.133s]
writing 'zip'...
(bootloader) zip header checking...
(bootloader) zip info parsing...
(bootloader) checking model ID...
(bootloader) checking custom ID...
(bootloader) total_image_number=9

(bootloader) start image[tz] unzipping & flushing...
(bootloader) [RUU]UZ,tz,0
(bootloader) [RUU]UZ,tz,76
(bootloader) [RUU]UZ,tz,100
(bootloader) [RUU]WP,tz,0
(bootloader) [RUU]WP,tz,100
(bootloader) ...... Successful
(bootloader) current_image_number=0

(bootloader) start image[adsp] unzipping & flushing...
(bootloader) [RUU]UZ,adsp,0
(bootloader) [RUU]UZ,adsp,6
(bootloader) [RUU]UZ,adsp,13
(bootloader) [RUU]UZ,adsp,21
(bootloader) [RUU]UZ,adsp,27
(bootloader) [RUU]UZ,adsp,34
(bootloader) [RUU]UZ,adsp,41
(bootloader) [RUU]UZ,adsp,48
(bootloader) [RUU]UZ,adsp,54
(bootloader) [RUU]UZ,adsp,61
(bootloader) [RUU]UZ,adsp,68
(bootloader) [RUU]UZ,adsp,74
(bootloader) [RUU]UZ,adsp,81
(bootloader) [RUU]UZ,adsp,88
(bootloader) [RUU]UZ,adsp,94
(bootloader) [RUU]UZ,adsp,99
(bootloader) [RUU]UZ,adsp,100
(bootloader) [RUU]WP,adsp,0
(bootloader) [RUU]WP,adsp,26
(bootloader) [RUU]WP,adsp,53
(bootloader) [RUU]WP,adsp,79
(bootloader) [RUU]WP,adsp,100
(bootloader) ...... Successful
(bootloader) current_image_number=1

(bootloader) start image[boot] unzipping & flushing...
(bootloader) [RUU]UZ,boot,0
(bootloader) [RUU]UZ,boot,6
(bootloader) [RUU]UZ,boot,12
(bootloader) [RUU]UZ,boot,18
(bootloader) [RUU]UZ,boot,25
(bootloader) [RUU]UZ,boot,33
(bootloader) [RUU]UZ,boot,43
(bootloader) [RUU]UZ,boot,55
(bootloader) [RUU]UZ,boot,62
(bootloader) [RUU]UZ,boot,68
(bootloader) [RUU]UZ,boot,74
(bootloader) [RUU]UZ,boot,80
(bootloader) [RUU]UZ,boot,87
(bootloader) [RUU]UZ,boot,93
(bootloader) [RUU]UZ,boot,99
(bootloader) [RUU]UZ,boot,100
(bootloader) [RUU]WP,boot,0
(bootloader) [RUU]WP,boot,100
(bootloader) ...... Successful
(bootloader) current_image_number=2

(bootloader) start image[recovery] unzipping & flushing...
(bootloader) [RUU]UZ,recovery,0
(bootloader) [RUU]UZ,recovery,8
(bootloader) [RUU]UZ,recovery,16
(bootloader) [RUU]UZ,recovery,22
(bootloader) [RUU]UZ,recovery,29
(bootloader) [RUU]UZ,recovery,37
(bootloader) [RUU]UZ,recovery,45
(bootloader) [RUU]UZ,recovery,51
(bootloader) [RUU]UZ,recovery,60
(bootloader) [RUU]UZ,recovery,68
(bootloader) [RUU]UZ,recovery,76
(bootloader) [RUU]UZ,recovery,85
(bootloader) [RUU]UZ,recovery,93
(bootloader) [RUU]UZ,recovery,100
(bootloader) [RUU]WP,recovery,0
(bootloader) [RUU]WP,recovery,66
(bootloader) [RUU]WP,recovery,100
(bootloader) ...... Successful
(bootloader) current_image_number=3

(bootloader) start image[rpm] unzipping & flushing...
(bootloader) [RUU]UZ,rpm,0
(bootloader) [RUU]UZ,rpm,100
(bootloader) [RUU]WP,rpm,0
(bootloader) [RUU]WP,rpm,100
(bootloader) ...... Successful
(bootloader) current_image_number=4

(bootloader) start image[sp1] unzipping & flushing...
(bootloader) [RUU]UZ,sp1,0
(bootloader) [RUU]UZ,sp1,20
(bootloader) [RUU]UZ,sp1,41
(bootloader) [RUU]UZ,sp1,77
(bootloader) [RUU]UZ,sp1,97
(bootloader) [RUU]UZ,sp1,100
(bootloader) [RUU]WP,sp1,0
(bootloader) [RUU]WP,sp1,100
(bootloader) ...... Successful
(bootloader) current_image_number=5

(bootloader) start image[system] unzipping & flushing...
(bootloader) [RUU]UZ,system,0
ERROR: usb_read failed with status e00002ed
FAILED (status read failed (No such file or directory))
finished. total time: 40.913s

For those who may think something is wrong, it may not be the case. Although I received the error above, my phone continued to go through the process of flashing the RUU. I was patient and let it finish. The last step running the "fastboot reboot" command will not work as I was at a black screen that looked like fastboot except I had none of the usual fastboot options (hboot, etc.), just the listing of the hardware info (model, CID, etc.). I held the power button for several seconds until the phone shut off completely. Turned it back on and it booted up fine. Ran through the setup process and everything seems to be working fine. I will update if my phone explodes or anything else I notice is wrong, but otherwise it's been great so far. Thanks graffixnyc!