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Problems installing Sage 8.3 on OSX

I am trying to install Sage 8.3 on OSX (latest version, 10.13.6)

I usually download the disk image and drag to Applications, so I attempted this with the file

sage-8.3-OSX_10.13.6-x86_64.dmg

and checked that the MD5 checksum matched the advertised MD5 sum on the download page.

On opening the disk image, a dialog saying "Verifying" opens up, and starts to verify, but then halts with an error message that I have not seen before:

"The following disk images couldn't be opened, (name of file), image data corrupted"

I downloaded again, and once again the MD5 checksum (called from a terminal window) was correct.

Then I ran Apple's "Disk Utility" and attempt to verify the image, which failed and produced a bunch of diagnostic data that I do not understand. (I have attached this diagnostic output in case it may be helpful)

Any assistance gratefully received.

Diagnostic output from "Disk Utility" starts here:

Checksumming Protective Master Boot Record (MBR : 0)…
Protective Master Boot Record (MBR :: verified   CRC32 $B149A7EF
Checksumming GPT Header (Primary GPT Header : 1)…
GPT Header (Primary GPT Header : 1): verified   CRC32 $D70C9635
Checksumming GPT Partition Data (Primary GPT Table : 2)…
GPT Partition Data (Primary GPT Tabl: verified   CRC32 $D7F0CD0F
Checksumming  (Apple_Free : 3)…
                (Apple_Free : 3): verified   CRC32 $00000000
Checksumming EFI System Partition (C12A7328-F81F-11D2-BA4B-00A0C93EC93B : 4)…
EFI System Partition (C12A7328-F81F-: verified   CRC32 $B54B659C
Checksumming disk image (Apple_APFS : 5)…
     disk image (Apple_APFS : 5): checksum failed with error 1000.
Operation failed with status 1000: image data corrupted
Operation failed…
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Problems installing Sage 8.3 on OSX

I am trying to install Sage 8.3 on OSX (latest version, 10.13.6)

I usually download the disk image and drag to Applications, so I attempted this with the file

sage-8.3-OSX_10.13.6-x86_64.dmg

and checked that the MD5 checksum matched the advertised MD5 sum on the download page.

On opening the disk image, a dialog saying "Verifying" opens up, and starts to verify, but then halts with an error message that I have not seen before:

"The following disk images couldn't be opened, (name of file), image data corrupted"

I downloaded again, and once again the MD5 checksum (called from a terminal window) was correct.

Then I ran Apple's "Disk Utility" and attempt to verify the image, which failed and produced a bunch of diagnostic data that I do not understand. (I have attached this diagnostic output in case it may be helpful)

Any assistance gratefully received.

Diagnostic output from "Disk Utility" starts here:

Checksumming Protective Master Boot Record (MBR : 0)…
Protective Master Boot Record (MBR :: verified   CRC32 $B149A7EF
Checksumming GPT Header (Primary GPT Header : 1)…
GPT Header (Primary GPT Header : 1): verified   CRC32 $D70C9635
Checksumming GPT Partition Data (Primary GPT Table : 2)…
GPT Partition Data (Primary GPT Tabl: verified   CRC32 $D7F0CD0F
Checksumming  (Apple_Free : 3)…
                (Apple_Free : 3): verified   CRC32 $00000000
Checksumming EFI System Partition (C12A7328-F81F-11D2-BA4B-00A0C93EC93B : 4)…
EFI System Partition (C12A7328-F81F-: verified   CRC32 $B54B659C
Checksumming disk image (Apple_APFS : 5)…
     disk image (Apple_APFS : 5): checksum failed with error 1000.
Operation failed with status 1000: image data corrupted
Operation failed…
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retagged

Problems installing Sage 8.3 on OSX

I am trying to install Sage 8.3 on OSX (latest version, 10.13.6)

I usually download the disk image and drag to Applications, so I attempted this with the file

sage-8.3-OSX_10.13.6-x86_64.dmg

and checked that the MD5 checksum matched the advertised MD5 sum on the download page.

On opening the disk image, a dialog saying "Verifying" opens up, and starts to verify, but then halts with an error message that I have not seen before:

"The following disk images couldn't be opened, (name of file), image data corrupted"

I downloaded again, and once again the MD5 checksum (called from a terminal window) was correct.

Then I ran Apple's "Disk Utility" and attempt to verify the image, which failed and produced a bunch of diagnostic data that I do not understand. (I have attached this diagnostic output in case it may be helpful)

Any assistance gratefully received.

Diagnostic output from "Disk Utility" starts here:

Checksumming Protective Master Boot Record (MBR : 0)…
Protective Master Boot Record (MBR :: verified   CRC32 $B149A7EF
Checksumming GPT Header (Primary GPT Header : 1)…
GPT Header (Primary GPT Header : 1): verified   CRC32 $D70C9635
Checksumming GPT Partition Data (Primary GPT Table : 2)…
GPT Partition Data (Primary GPT Tabl: verified   CRC32 $D7F0CD0F
Checksumming  (Apple_Free : 3)…
                (Apple_Free : 3): verified   CRC32 $00000000
Checksumming EFI System Partition (C12A7328-F81F-11D2-BA4B-00A0C93EC93B : 4)…
EFI System Partition (C12A7328-F81F-: verified   CRC32 $B54B659C
Checksumming disk image (Apple_APFS : 5)…
     disk image (Apple_APFS : 5): checksum failed with error 1000.
Operation failed with status 1000: image data corrupted
Operation failed…