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JustinThought - my 14.0.24210 was installed on 2016-10-31, the same day I installed Sigil 0.9.7, nothing else was installed on that date - so it can be assumed its install was initiated by the Sigil install.
My memory is that the Sigil install initiates a
download and install of the C++ run time it needs. Maybe it couldn't do that because your laptop has no internet, hence you're stuck on the old version of the C++ runtime.
A search for 'c++ runtime 14.0.24210' leaves me with the impression that 14.0.24210 was only ever distributed within the VS package or via msdn subscriptions. As you've discovered the
Download Visual C++ Redistributable for Visual Studio 2015 from Official Microsoft Download Center is still coughing up 14.0.23026.
So the question is - where does one get the version of the C++ runtime Sigil needs if there is no internet connection on the machine on which Sigil is being installed?
BR
Added: irrelevant, but... a couple of weeks ago the Secunia PSI tool I have installed notified me out of the blue that nine VS C++ run time libraries had been uninstalled, yet I hadn't knowingly installed, reinstalled or uninstalled anything for a week or more. I had noticed there seemed to be an ever increasing number of of them. It's down to a more reasonable number now. I have no idea what triggered their removal, nothing has stopped working. This is on Win 10 1511, Windows Update is set to Notify, and Upgrades are deferred. Bit spooky.