[This is preliminary documentation and subject to change.]
The InstallExecute action runs a script containing all operations spooled since the start of the install or the last InstallFinalize action. It updates the system without ending the transaction.
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This action occurs in the sequence between the InstallInitialize action the InstallFinalize action.
The InstallExecute action is similar to the InstallFinalize action but InstallExecute does not end the transaction. This action will update the system with whatever operations have been determined to that point.