Using refresh files in 8.1

You don't. You will need to reinstall Windows 8.0 then upgrade to 8.1 again unless you can get a 8.1 ISO.
 

My Computer

System One

  • OS
    Windows 10 Pro X64
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Lenovo IdeaCenter K450
    CPU
    Intel Quad Core i7-4770 @ 3.4Ghz
    Motherboard
    Lenovo
    Memory
    16.0GB PC3-12800 DDR3 SDRAM 1600 MHz
    Graphics Card(s)
    Intel Integrated HD Graphics
    Sound Card
    Realtek HD Audio
    Monitor(s) Displays
    HP h2207
    Screen Resolution
    1680x1050@59Hz
    Hard Drives
    250GB Samsung EVO SATA-3 SSD;
    2TB Seagate ST2000DM001 SATA-2;
    1.5TB Seagate ST3150041AS SATA
    PSU
    500W
    Keyboard
    Wired USB
    Mouse
    Wired USB
    Internet Speed
    3GB Up, 30GB Down
    Browser
    SeaMonkey
    Antivirus
    Windows Defender; MBAM Pro
    Other Info
    UEFI/GPT
    PLDS DVD-RW DH16AERSH
That's the million dollar question. Search Google for a Windows 8.1 download that matches what you have. Once downloaded, make sure the MD5/SHA check sums match a known good iso.

There is no known legal download site for Windows 8 or 8.1.
 

My Computer

System One

  • OS
    Windows 10 Pro X64
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Lenovo IdeaCenter K450
    CPU
    Intel Quad Core i7-4770 @ 3.4Ghz
    Motherboard
    Lenovo
    Memory
    16.0GB PC3-12800 DDR3 SDRAM 1600 MHz
    Graphics Card(s)
    Intel Integrated HD Graphics
    Sound Card
    Realtek HD Audio
    Monitor(s) Displays
    HP h2207
    Screen Resolution
    1680x1050@59Hz
    Hard Drives
    250GB Samsung EVO SATA-3 SSD;
    2TB Seagate ST2000DM001 SATA-2;
    1.5TB Seagate ST3150041AS SATA
    PSU
    500W
    Keyboard
    Wired USB
    Mouse
    Wired USB
    Internet Speed
    3GB Up, 30GB Down
    Browser
    SeaMonkey
    Antivirus
    Windows Defender; MBAM Pro
    Other Info
    UEFI/GPT
    PLDS DVD-RW DH16AERSH

My Computer

System One

  • OS
    Windows 10 Pro X64
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Lenovo IdeaCenter K450
    CPU
    Intel Quad Core i7-4770 @ 3.4Ghz
    Motherboard
    Lenovo
    Memory
    16.0GB PC3-12800 DDR3 SDRAM 1600 MHz
    Graphics Card(s)
    Intel Integrated HD Graphics
    Sound Card
    Realtek HD Audio
    Monitor(s) Displays
    HP h2207
    Screen Resolution
    1680x1050@59Hz
    Hard Drives
    250GB Samsung EVO SATA-3 SSD;
    2TB Seagate ST2000DM001 SATA-2;
    1.5TB Seagate ST3150041AS SATA
    PSU
    500W
    Keyboard
    Wired USB
    Mouse
    Wired USB
    Internet Speed
    3GB Up, 30GB Down
    Browser
    SeaMonkey
    Antivirus
    Windows Defender; MBAM Pro
    Other Info
    UEFI/GPT
    PLDS DVD-RW DH16AERSH
If you are using CoreSingleLanguage, that is harder to find. It is different from Core.
 

My Computer

System One

  • OS
    7/8/ubuntu/Linux Deepin
    Computer type
    PC/Desktop
Give it a try then, see what happens.
 

My Computer

System One

  • OS
    Windows 10 Pro X64
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Lenovo IdeaCenter K450
    CPU
    Intel Quad Core i7-4770 @ 3.4Ghz
    Motherboard
    Lenovo
    Memory
    16.0GB PC3-12800 DDR3 SDRAM 1600 MHz
    Graphics Card(s)
    Intel Integrated HD Graphics
    Sound Card
    Realtek HD Audio
    Monitor(s) Displays
    HP h2207
    Screen Resolution
    1680x1050@59Hz
    Hard Drives
    250GB Samsung EVO SATA-3 SSD;
    2TB Seagate ST2000DM001 SATA-2;
    1.5TB Seagate ST3150041AS SATA
    PSU
    500W
    Keyboard
    Wired USB
    Mouse
    Wired USB
    Internet Speed
    3GB Up, 30GB Down
    Browser
    SeaMonkey
    Antivirus
    Windows Defender; MBAM Pro
    Other Info
    UEFI/GPT
    PLDS DVD-RW DH16AERSH
Backup your data first.
 

My Computer

System One

  • OS
    Windows 10 Pro X64
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Lenovo IdeaCenter K450
    CPU
    Intel Quad Core i7-4770 @ 3.4Ghz
    Motherboard
    Lenovo
    Memory
    16.0GB PC3-12800 DDR3 SDRAM 1600 MHz
    Graphics Card(s)
    Intel Integrated HD Graphics
    Sound Card
    Realtek HD Audio
    Monitor(s) Displays
    HP h2207
    Screen Resolution
    1680x1050@59Hz
    Hard Drives
    250GB Samsung EVO SATA-3 SSD;
    2TB Seagate ST2000DM001 SATA-2;
    1.5TB Seagate ST3150041AS SATA
    PSU
    500W
    Keyboard
    Wired USB
    Mouse
    Wired USB
    Internet Speed
    3GB Up, 30GB Down
    Browser
    SeaMonkey
    Antivirus
    Windows Defender; MBAM Pro
    Other Info
    UEFI/GPT
    PLDS DVD-RW DH16AERSH
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