A very useful guide on how to download specific files (such as older versions of games) on Steam:

https://www.reddit.com/r/Steam/comments/611h5e/guide_how_to_download_older_versions_of_a_game_on/

After performing actions which causes the SID to change (such as sysprep or a DC promote/demote), when opening an existing task in the task scheduler, you may encounter the following error:

Task Scheduler
General page initialization failed.
The specific error is:
"0x8007000d: The data is invalid." An error has occurredattempting to retrieve task account information.
You may continue editing the task object, but will beunable to change task account information.

As a result, it is also not possible to view or change the account information for the selected task.

To work around the issue, remove a saved RSA key, which has been invalidated with the change:

Stop the Task Scheduler s  ...