Loosing communicator file

[KTB]

Well I never could get the communicator 4.5 file moved.  I decided to
download from /tmp to see if the download would end up in the /tmp
directory and it did.  I decided to install it later and went into
windows to check my mail and when I came back to install the file was
gone.  Is this a common thing?  Also while downloading I can choose from
the "supported" or "unsupported" communicator 4.5.  Is there any
difference?  I couldn't find anything at the site about which to pick.
Thanks,
Kent