Manual:
https://www.virtualbox.org/manual/
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!!!   http://download.virtualbox.org/virtualbox/

z.B.
https://www.virtualbox.org/wiki/Download_Old_Builds_2_0
...
https://www.virtualbox.org/wiki/Download_Old_Builds_3_0
...
https://www.virtualbox.org/wiki/Download_Old_Builds_4_0
https://www.virtualbox.org/wiki/Download_Old_Builds_4_1
https://www.virtualbox.org/wiki/Download_Old_Builds_4_2
https://www.virtualbox.org/wiki/Download_Old_Builds_4_3
https://www.virtualbox.org/wiki/Download_Old_Builds_5_0