DotLRN is typically running for large organization, so it is most time running on a server (linux, *BSD, ...). To get this done, the quickest way is currently to install OpenACS using [1], and when it is started to install from the web GUI DotLRN.
Since you are mentioning PC: in case, you want to install it under windows, checkout [2].
all the best
-g
[1] https://openacs.org/xowiki/naviserver-openacs.
[2] https://openacs.org/xowiki/openacs-system-install-windows-server