[Hitch]

This thread isn't particularly helpful. Calibre won't install 0.74 over 0.75 using the Windows Installer package because it has detected a "newer version," and for whatever reason, 0.75 won't convert my epbubs to mobis, suddenly (the epubs are clean, even 1.05 validate). Calibre just sits there and churns on a smallish file. I'd like to roll back to 0.74, which was working, I think, for conversions (Windows, XP). (It might have been all the way back to 0.72 or 3 when I last converted an epub to a mobi).

Can someone tell me if I have to completely uninstall Calibre in order to reinstall 0.74? Thanks.

n.b. - It would still be good to know if there's a simple(r) way to roll back, but it is working, albeit shockingly slowly, comparatively speaking...it took me 13 minutes to convert a 600kb file, all text with one 450x550 cover at 300dpi and 5 thumbnails of 13k each. I have no idea why it's this dog-slow, I never had this problem before....???