After having a quick look at ArrisCAD (Architectual is not my area of expertise), it looks to be pretty proprietary; even the DXF translator is a add-on, pay for use application. It looks like you pretty much need an install of Arris in order to read their files.
Did your client have someone else do some of their work in Arris, and now they wants you to take the files and finish the work?
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