An alternative is to use a Notification (write-File) and use it as part of the flow process.
This can get a little more fancy/tricky... :)
Also not tested, but thinking outside the box here.
Job1 - Set a new JobVariable called "OutputFilePath", set the value to your log file, i.e. C:\Temp\VisualCron\Output\Job1.txt
This variable would be called {JOB(Active,Variable,OutputFilePath)} , assuming you're referencing the active job. You would do this for all the jobs.
Now, create a new Notification (we'll create 3 total), which will be a 'Write file' task.
First notification will be named "Write Output - 1st Task only". The 'File Path' will be your variable, {JOB(Active,Variable,OutputFilePath)}
Uncheck the box for 'Append to file', which will overwrite the file. This is why we have 2 notifications. First one will erase the previous.
The 'Value' would be {TASK(PrevTask,StdOut)}
Now create a 2nd notification, same as above, called "Write Output - All other Tasks". This time, check the box for 'Append to file'.
What that does is makes a very generic notification that will use the OutputFilePath variable from the job running the notification... and write the value of the 'PreviousTask' to that file. PreviousTask, becuase the notification itself is a task... so the PreviousTask is actually the task you want.
Now, create a 3rd notification that will be an e-mail notification called "E-mail Job Output". Use variables to fill in the job name, etc... wherever you want inside the message body and/or subject. Attach a file, by using the {JOB(Active,Variable,OutputFilePath)} variable.
NOW, back to the job/tasks themselves.
Task1, edit the flow to add a 'on success' or just 'always' run Notification "Write Output - 1st Task only".
Task2, 3, 4, etc... Edit the flow on the task to run the other notification, "Write Output - All other Tasks".
On the LAST task in the job, add an additional Flow item that runs the "E-mail Job Output" Notification.
1st task will write/overwrite the log file
2nd, etc... task will append their data to the log file
Last task will also send an e-mail created by the other notifications.
As long as the variables i've mentioned work in all the screens i've mentioned, this would work quite well.
Brian