HTC US link for E8 lollipop update have "suspected wrong file" name as
Website Link : http://www.htc.com/us/support/htc-one-e8-sprint/news/
go down to bottom and you'll see RUU link as HTC M9 HIMA "RUU_HIMA_UL_L50_SENSE70_ATT_NA_Gen_Unlock_1.32.617.30_Radio_01.01_U11440221_62.05.50320G_F_release_427069_signed_2.exe"
After updated phone running faster & have good battery backup with improved camera software.
Does it improve the battery life?
Why?It is very powerful device...
Don't update5.0 your phone will hang