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Al's picture

Hello,

1) The installer only supports 32 bit, if you want to use a 64 bit version you can download the stand-alone version.  Currently either version doesn't support the preview display though.
The other option is to install it manually, but use for the 64 bit versions of all the dependencies - this is a bit more time consuming unfortunately.
As the installer cannot download the 64 bit libraries there's not going to be a 64 bit installer for the foreseeable future.

2) To get measurements you have to select a range of the spectrum by dragging an area with the middle mouse button.

Thanks very much, glad you like it!