Looking for old version of quickbooks australian version disc as I have lost mine and need to reinst

I have an old version of quickbooks that I was using, successfully, when my Computer was attacked by a virius and the technician had to clean up the computer. This meant that he uninstalled my quickbooks and I can’t find my original disc to reinstall the program back into my computer, is there any way that I can identify the version that is on my computer and also Aquire an old version of quickbooks australian version? Or how do I solve my problem so that I can access my data.