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Try as I may, I cannot get Boot Camp on macOS High Sierra to accept any Windows 7 installer DVD (or ISO) I have tried yet. Although Boot Camp seems to be able to accept a flash drive, when I try one I get the error:

The installer disc could not be found. Insert your Windows installer disc and wait a few seconds for the disc to be recognized.

So, since this is a Mid 2010 MacBook Pro (which has an optical drive) I've tried a legit Win7 SP1 retail DVD (checksum verified), but then I get this error:

Boot Camp only support installing Windows 7 on this Mac. Please insert a USB drive or DVD which contains a full version of Windows 7.

Does that mean "full" as in all editions of Win7, so Home, Pro, Ultimate, etc?? Documentation for this online is very sparse and lacking, I've found.

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    I think you might need Boot Camp 5.1 for that Mac - see en.wikipedia.org/wiki/Boot_Camp_(software) [Not completely certain but may be worth a shot]. – Tetsujin Jun 27 at 14:42
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    Ah - I found a list... v5 or v4 depending on precise Mac model [scroll way down...] support.apple.com/HT205016 – Tetsujin Jun 27 at 14:45
  • All these downloads from Apple are .EXE files...? I need the actual .APP file program for the older v4 version of Boot Camp to run it inside of macOS High Sierra. Any idea where I can find that? – SamAndrew81 Jun 27 at 17:12
  • I'm going to have to either give up or maybe try installing Windows manually without Boot Camp Assistant. Far as I can tell, the old versions of BC Assistant .APP just do not exist anywhere on the internet whatsoever. – SamAndrew81 Jun 27 at 17:32
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    Windows 7 comes in either "upgrade" or "full" versions. A clean install of Windows 7 can be made on a PC by using either a "full" version or an "upgrade version DVD. However, during the process of installing, an "upgrade" Windows 7 version DVD will ask for you to insert an acceptable previous Windows version (i.e. 2000, XP or Vista) in the DVD drive. On Macs, there is no way to eject the "upgrade" Windows 7 version DVD and insert the previous Windows version DVD, therefore an "upgrade" Windows 7 version DVD can not be used. You must use a "full" Windows 7 version DVD. – David Anderson Jun 30 at 11:22
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Steps to Install Windows 7 without Using the Boot Camp Assistant

Although a Windows 7 can be installed without using the both the Boot Camp Assistant and a Windows 7 installation DVD, the using a the DVD greatly simplifies the procedure. Since you have a working optical drive, I the steps given below will include using this drive.

Note: According to Apple, you need a Windows 7 DVD with Service Pack 1 (SP1) included.

Create the Flash Drive with the Windows Support Software

  1. Use the Disk Utility to erase a 8 GB or larger flash drive. For name, use WSS. For format, use MS-DOS (FAT). For scheme, use Master Boot Record.
  2. Download the "Windows Support Software" for you Mac from the website Install Windows 7 on your Mac using Boot Camp.
  3. Copy the "Windows Support Software" to the flash drive.
  4. Under Safari preferences, select Advance. Make sure Show Develop menu in menu bar is checked off. See image below.

  5. From a window opened in Safari, go to the website https://sourceforge.net/projects/gptfdisk/. While at this website, select Develop->User Agent->Microsoft Edge from the menu bar, then click the Download button on the webpage.

  6. From the downloaded files, copy gdisk64.exe to the root folder on the flash drive.
  7. Either close the Safari window or select Develop->User Agent->Default from the menu bar.

Install Windows 7

Note: If during the installation of Windows, the Mac restarts back to macOS, then open the "Startup Disk" pane of the "System Preferences" application and restart back to Windows. The installation of Windows will continue from where it left off.

  1. Use the Disk Utility application to partition the internal drive. Add a new partition named BOOTCAMP with the format MS-DOS (FAT).

    Note: after partitioning completes, you may have to quit and then open the Disk Utility application to see the correct results.

  2. Insert the Windows 7 DVD in the optical drive.

  3. Insert the Windows Support Software flash drive in a USB port.

  4. Restart the Mac and immediately hold down the option key. Release the key when the Startup Manager icons appears. Select the icon labeled Windows.

  5. When the window below appears, select Custom (advanced).

  6. The BOOTCAMP partition should be either 3 or 4. Remember the number, you will need this later.

  7. Press the shift+F10 key combination to open a Command Prompt window.

  8. Enter the command shown below. Remember the drive letter (name) for the WSS volume.

    wmic logicaldisk get name,volumename
    
  9. Enter the command below to execute gdisk. If drive letter (name) for the WSS volume is not D:, then make the appropriate substitution.

    D:\gdisk64 \\.\PhysicalDrive0
    
  10. Change the type of partitioning to hybrid. If the BOOTCAMP partition is number 3, then enter the commands given below.

    r
    h
    2 3
    y
    ff
    n
    07
    y
    n
    w
    y
    

    Otherwise, if the BOOTCAMP partition is number 4, then enter the commands given below.

    Note: If macOS is using encryption, the substitute ac for af below.

    r
    h
    2 3 4
    y
    af
    n
    ab
    n
    07
    y
    w
    y
    
  11. Enter the exit command to close the Command Prompt window.

  12. Click on the Refresh button.

  13. Select the BOOTCAMP partition. Before clicking the Next button, you will have to format the partition by first clicking on Drive options (advanced), then clicking on the Format button.

  14. After finishing installing Windows 7, execute the setup application on the Windows Support Software flash drive.

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