Hi, to be perfectly honest, I do not have a 'technical' understanding of this issue. My response was based on the fact that I am cautious by nature. Being cautious, I would like to avoid all possibility of confusion or conflict between versions, therefore I would never install two versions on the same machine. The fact that only one version of Inkscape showed up in the Control Panel->Programs and Features, even after multiple installations, would already be enough to cause me some concern. However, here is a possible explanation of your problem (just speculating). Assume that your first installation of Inkscape was a 32 bit version, and that it went into the (x86) folder. This fact will certainly be recorded in the registry somewhere, and it is possible that Windows may try to force _all_ subsequent versions to go into this same directory, regardless of their origin. Again, just speculating. One way to test this hypothesis would be to uninstall all Inkscape versions from your computer until the Control Panel entry for Inkscape is empty, and then try to do a 64-bit install to see if it installs normally into the right folder. Alternatively, what you could do is just take the easy way out, and use the 7z distribution, which is guaranteed to work with no hassles.
good luck, Alvin
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