Useful or not, from you.
flutter Unable to 'pub upgrade' flutter tool.

Guys Please help me!!

C:\Users\git>flutter doctor
Updating flutter tool...
The system cannot find the path specified.
Error: Unable to 'pub upgrade' flutter tool. Retrying in five seconds...

Waiting for 0 seconds, press CTRL+C to quit ...
The system cannot find the path specified.
Error: Unable to 'pub upgrade' flutter tool. Retrying in five seconds...

Waiting for 3 seconds, press CTRL+C to quit ...
Terminate batch job (Y/N)?

version of PowerShell do you have on your system :

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To know which code path gets triggered in the system Get-Command 7z Get-Command Expand-Archive

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That's a useful answer
Without any help

I'm getting this error:

Downloading the Dart SDK using the BITS service failed, retrying with WebRequest...
Unzipping Dart SDK...
Exception calling "ExtractToFile" with "3" argument(s): "The process cannot access the file 'C:\src\flutter\bin\cache\dart-sdk\bin\dart.exe' because it is being used by another process."
At C:\WINDOWS\system32\WindowsPowerShell\v1.0\Modules\Microsoft.PowerShell.Archive\Microsoft.PowerShell.Archive.psm1:1059 char:25
+ ...             [System.IO.Compression.ZipFileExtensions]::ExtractToFile( ...
+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : IOException

Building flutter tool...
Running pub upgrade...
The system cannot find the path specified.
Error (1): Unable to 'pub upgrade' flutter tool. Retrying in five seconds... (9 tries left)
Running pub upgrade...
The system cannot find the path specified.
Error (1): Unable to 'pub upgrade' flutter tool. Retrying in five seconds... (8 tries left)
Running pub upgrade...
The system cannot find the path specified.

And it continues failing from there.

Edit: It worked after deleting cache and re-running from the cmd line.