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I have’t used Pacifist lately, you have to click on Package Resources. There you can see and extract Shared Support, mount it and in the .xml and .json files from /Volumes/Shared\ Support/com_apple_MobileAsset_MobileSoftwareUpdate_MacUpdateBrain/ you will find the build number of the macOS being installed.
Package Resources.jpg


Without using Pacifist, from Terminal:

Extract InstallAssistant.pkg into ~/tmp
Code:
pkgutil --expand ~/Downloads/InstallAssistant.pkg ~/tmp

Mount InstallAssistant.pkg ~/tmp
Code:
hdiutil attach ~/tmp/SharedSupport.dmg -noverify

Open the .xml or .json files in TextEdit
Code:
open -e /Volumes/Shared\ Support/com_apple_MobileAsset_MobileSoftwareUpdate_MacUpdateBrain/*.json

Code:
open -e /Volumes/Shared\ Support/com_apple_MobileAsset_MobileSoftwareUpdate_MacUpdateBrain/com_apple_MobileAsset_MobileSoftwareUpdate_MacUpdateBrain.xml

Unmount SharedSupport.dmg
Code:
hdiutil detach /Volumes/Shared\ Support

Move the temporary folder to Trash
Code:
mv ~/tmp ~/.Trash/tmp
 
  • Like
Reactions: katbel
Thank you for that!
Well I'll be durned..
The .xml file does indeed show the Build as 24H16!

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>AssetType</key>
<string>com.apple.MobileAsset.MobileSoftwareUpdate.MacUpdateBrain</string>
<key>Assets</key>
<array>
<dict>
<key>Build</key>
<string>24H16</string>
<key>OSVersion</key>
<string>15.8</string>
<key>_CompatibilityVersion</key>
<integer>20</integer>
<key>_CompressionAlgorithm</key>
<string>zip</string>
<key>_ContentVersion</key>
<integer>2171140016702001</integer>
<key>_DownloadSize</key>
<integer>4150582</integer>
<key>_IsZipStreamable</key>
<true/>
<key>_MasteredVersion</key>
<string>16</string>
<key>_Measurement</key>
<data>
ZLZ767Bx5TLO/5wceuQ5EO0y+ng=
</data>
<key>_Measurement-SHA256</key>
<data>
20f90g+ZZrsGXM4i8j19s/poB2PThtLr89LoqODZUFo=
</data>
<key>_MeasurementAlgorithm</key>
<string>SHA-1</string>
<key>_UnarchivedSize</key>
<integer>11971584</integer>
<key>__BaseURL</key>
<string>https://woolyjumper.sd.apple.com/assets/GlowSecurityFizz/GlowSecurityFizz24H16</string>
<key>__CanUseLocalCacheServer</key>
<true/>
<key>__RelativePath</key>
<string>com_apple_MobileAsset_MobileSoftwareUpdate_MacUpdateBrain/64b67bebb071e532ceff9c1c7ae43910ed32fa78.zip</string>
</dict>
</array>
<key>FormatVersion</key>
<integer>1</integer>
</dict>
</plist>
 
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