Welcome to the Bach Gesellschaft download page. General info about this historical edition can be found in the Wikipedia article. These books are all public domain (published 1900, 1926)
To open these files you need either Lizardtech's (free) DJVU plugin or the (also free and somewhat better) WinDJVU application.
The Handschrift Volume (#44), containing selected manuscript facsimiles, is not included.
The index volume (BGA Band 46_index_searchable.djvu) has an OCR text layer, meaning you can conduct textual searches, to facilitate locating Bach's works.
A useful index in HTML is available here.
In case that link does't work - here is a mirror.
Please report dead links
Note that sometimes Mediafire links go down for a while (retry after a few hours). Also try right-clicking the "Download" link in Mediafire and selecting "Save target as..." or "Save link as..." (Firefox).
The Volumes:
All Uploaded Volumes (shared folder) <- This is a page with all the volumes, making the links below quite superfluous. But I had to put in something to make this site look less empty, thus:
