In case you are interested in downloading the *full* offline standalone digital version of StarCraft+BroodWar 1.15.2 from Blizzard's servers without any Battle.net account, you can do it for free with their own Legacy Downloader. This version will not replace your CD-ROM one unfortunately (there might be at least one difference in the Registry entries iirc, I vaguely remember reading it a long time ago...). But hey...
I hope someday Blizzard might eventually also make official optical media image files available, for their classic games (D2, WC3, SCBW). As of this writing, only the full standalone digital download versions of D2 v1.14b, SC v1.15.2 and WC3 v1.27a are freely downloadable from them, without any Battle.net account, in any language and for any OS
;D
The *full* digital versions of Diablo II v1.14b, StarCraft v1.15.2 and WC3 v1.27a (plus their respective expansions) are free to download from Blizzard's servers, by anybody and without any Battle.net account (because Blizzard has removed the checks!). They can be downloaded in any language, and for any OS.
CD-keys are still required to install them after you have downloaded them. Diablo II 1.14b requires a 26-digit CD-key.