Hi, computers will not download this update because they think it's not appicable. So they will not install it.
IsApplicable rules for Adobe Flash Player 12.0.0.77 are :
<bar:RegKeyExists Key="HKEY_LOCAL_MACHINE" Subkey="Software\Classes\CLSID{D27CDB6E-AE6D-11cf-96B8-444553540000}" RegType32="true"/>
And
<lar:Not>
<bar:RegDword Key="HKEY_LOCAL_MACHINE" Subkey="Software\Macromedia\FlashPlayer\SafeVersions" Value="12.0" Comparison="GreaterThanOrEqualTo" Data="77" RegType32="true"/>
</lar:Not>
And
<bar:WindowsVersion Comparison="GreaterThanOrEqualTo" MajorVersion="5" MinorVersion="0" ServicePackMajor="0" ServicePackMinor="0"/> <= Min Win 2000
So, ensure these registry key are ok on client computers.
Also, you can try to launch manually the MSI file to see if any error appear.
IsApplicable rules for Adobe Flash Player 12.0.0.77 are :
<bar:RegKeyExists Key="HKEY_LOCAL_MACHINE" Subkey="Software\Classes\CLSID{D27CDB6E-AE6D-11cf-96B8-444553540000}" RegType32="true"/>
And
<lar:Not>
<bar:RegDword Key="HKEY_LOCAL_MACHINE" Subkey="Software\Macromedia\FlashPlayer\SafeVersions" Value="12.0" Comparison="GreaterThanOrEqualTo" Data="77" RegType32="true"/>
</lar:Not>
And
<bar:WindowsVersion Comparison="GreaterThanOrEqualTo" MajorVersion="5" MinorVersion="0" ServicePackMajor="0" ServicePackMinor="0"/> <= Min Win 2000
So, ensure these registry key are ok on client computers.
Also, you can try to launch manually the MSI file to see if any error appear.