Unable to use any version newer than 0.7.4

[oldpink]

I use this program frequently, but it's disappointing that I am unable to use anything beyond version 0.7.4.
When I try newer versions, I consistently get the following errors:

Traceback (most recent call last):
File "/usr/bin/xlsx2csv", line 1125, in
xlsx2csv = Xlsx2csv(options.infile, **kwargs)
File "/usr/bin/xlsx2csv", line 196, in init
self.styles = self._parse(Styles, self.content_types.types["styles"])
File "/usr/bin/xlsx2csv", line 339, in _parse
instance.parse(filehandle)
File "/usr/bin/xlsx2csv", line 498, in parse
numFmtId = int(cellXfs._attrs['applyNumberFormat'].value)
KeyError: 'applyNumberFormat'

I'm pretty sure that there is a missing dependency, but I have no idea what that may be or how to install it.
Does anyone have any suggestions?