How does setup.exe cleanup?

[caj@cs.york.ac.uk]

Hi,

I was just wondering, does setup.exe perform any cleaning up of old
downloaded packages from the local package cache, and if so how?

Also, can I assume that any package file that is on a server will never be
changed, or are sometimes packages updated without changing the name?
(even if it is only for a very short period of time)

Thank you,

Chris

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