Lightning 4.0.0.1 could not be installed because Thunderbird cannot modify the needed file.
I have tried every solution that I found in this forum and nothing works. I cannot figure this one out. The needed file is where and what file? I have uninstalled everything and reinstalled the add on every way possible. I have removed the add on folder for lightning and still cannot make it run. It says that it will be installed after restart but I can tell that it will not because when I try to install the add on from file the progress bar stops at the very beginning. A few times I got the above message in a red bar at the top of the screen about the needed file. I have set permissions to everything I can think of but still cannot get Lightning to install. Hope someone else has the solution. None of the posted ones have worked.
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Something quite fundamental that you haven't mentioned.
Windows, Mac or Linux?
Zenos said
Something quite fundamental that you haven't mentioned. Windows, Mac or Linux?
I had edited the question right after I received your email to include Window 7 32 bit but I do not see it mentioned.
It took me all day to get set up to post in this forum and I had to start over several times before I figured it out and became brain dead by the time I finally posted successfully.
I cannot figure out what file Thunderbird is trying to write to. I have modified permissions everywhere I can think of. Somehow my system is blocking this function. I am going to try disabling my AV program and see what happens.
Well that did not work either. I am doomed. :-)
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Discussion continues in a new thread here: https://support.mozilla.org/questions/1071367