Thansk Alex. I was eventually able to make it work using *ant* as you suggested.
The install failed frequently, when a redirect from HTTP to HTTPS occurred on a file *get*. To get around this, I created the local.properties file in the root directory of Flex. Then for only the problem files, I would add properties pointing to a local version of the file I'd downloaded using the URL reported in the error, like below. Note, the ones here were the ones I specifically had issues with. osmf.url.server=file:///C:/Development/_SDK/ osmf.url.folder=Build osmf.url.file=OSMF2_0.swc afe.url.server=file:///C:/Development/_SDK/ afe.url.folder=Build afe.url.file=afe.jar agl.url.server=file:///C:/Development/_SDK/ agl.url.folder=Build agl.url.file=aglj40.jar fontkit.url.server=file:///C:/Development/_SDK/ fontkit.url.folder=Build fontkit.url.file=flex-fontkit.jar rideau.url.server=file:///C:/Development/_SDK/ rideau.url.folder=Build rideau.url.file=rideau.jar -- Sent from: http://apache-flex-development.2333347.n4.nabble.com/