Hi,
I was trying to upgrade my 1.45 install of Calibre to 2.0 64-bits on my Windows 8.1 PC, but I kept getting this error message from the installer:
This would translate to "Key not valid for use in specified state".
I've tried uninstalling Calibre 1.45, running a registry clean-up, but now, not only can I still not install Calibre 2.0, I also can't install Calibre 1.45.
The problem occurs either with the 32 or 64 bits versions.
Can anybody help?
Thanks!
R.