Missing resources in FLAIR 3.2 installation files?

After a successful installation of fluka 4-3.0 on Ubuntu 20.04 LTS, as usual, I proceeded with installing Flair 3.2.
Using a terminal, I asked to upgrade from the ubuntu repository by typing ‘apt upgrade’, but apt returned with a “nothing to upgrade” message. So, I moved to the flair site, and after downloading the new flair and flair-geoviewer packages, I successfully installed it manually.
Launching “flair” on a terminal produces the following traceback:
tino@oldboy:~$ flair
Traceback (most recent call last):
File “/usr/local/flair/flair.py”, line 3405, in
if not tkFlair._SKIP_INTRO: tkFlair.aboutDialog(flair, 2500)
File “/usr/local/flair/tkFlair.py”, line 1585, in aboutDialog
img = tk.PhotoImage(file=fn)
File “/usr/lib/python3.8/tkinter/init.py”, line 4064, in init
Image.init(self, ‘photo’, name, cnf, master, **kw)
File “/usr/lib/python3.8/tkinter/init.py”, line 4009, in init
self.tk.call((‘image’, ‘create’, imgtype, name,) + options)
_tkinter.TclError: couldn’t open “/usr/local/flair/manual/html/_images/flair-logo.gif”: no such file or directory

That is caused by the absence of some resources in the flair manual (running flair with the -s option allowed the program to run, but the flair manual appears to be missed).
This problem was confirmed when I tried to install flair using the tgz source files: the “make install” stops when sphinx-build is called because some resources requested to build the flair manual weren’t found. Here is the message
make[1]: Entering directory ‘/home/tino/Flair3.2/flair-3.2/manual’
cp -Rdpvu …/icons .
sphinx-build -M html “.” “.”
Running Sphinx v1.8.5
building [mo]: targets for 0 po files that are out of date
building [html]: targets for 69 source files that are out of date
updating environment: 69 added, 0 changed, 0 removed
reading sources… [100%] prologue
/home/tino/Flair3.2/flair-3.2/manual/index.rst:31: WARNING: Unexpected indentation.
/home/tino/Flair3.2/flair-3.2/manual/prologue.rst:164: WARNING: Error parsing content block for the “list-table” directive: uniform two-level bullet list expected, but row 3 does not contain the same number of items as row 1 (1 vs 2).

… list-table::
:widths: 25 75

    • -1
    • Load the first flair file in the folder
    • --compile
    • Compile executable
    • -c # | --convert #
      • Convert to simulation mode
    • -d
    • Activate the beta-development features
    • -D
    • Deactivate beta-development features (default)
    • --data #
    • Process/Merge the data files of all or specific runs (no default)
      Accepts patterns or comma separated names e.g. * or foo* or foo,bar*
    • --exe file
    • Fluka executable. (default: {FlukaDir}/bin/fluka)
    • -h|-?|--help
    • print this help page
    • -i/--ini file
    • Alternative configuration file (default: $HOME/.flair/flair.ini)
    • -l | --list
    • List recent projects
    • -m #
    • Force mode of new project/input
      Accepted types: fluka, moira, mcnp, phits
    • --noansi
    • disable ansi coloring on dumps
    • --nocleanup
    • disable cleanup of temporary files
    • -p
    • enable profiling
    • -P
    • disable profiling (default)
    • --page #
    • Start flair in specified page
    • --plots
    • Do all plots and save the files
    • -r|--recent
    • Load most recent project
    • -R #
    • Load recent project (number 1…10 or filename)
    • --run #
    • Start runs given as (name, pattern or a comma-list of runs)
    • -s
    • Skip About dialog
    • -u | --update
    • Recalculate and save input file variables
    • -v | --verbose
    • Increase verbosity level by one
    • -V
    • Decrease verbosity level by one
    • filename[s]

    • flair project, input, imported files or directory
      automatically detect type from file extension
      extensions supported:

         <none|.flair>, .inp, .fluka,
         .moira, .mac[ro], .gdml
         .mcnp, .m, .phits, .pht,

Sphinx error:
master file /home/tino/Flair3.2/flair-3.2/manual/contents.rst not found
make[1]: *** [makefile:27: html] Error 2
make[1]: Leaving directory ‘/home/tino/Flair3.2/flair-3.2/manual’
make: *** [makefile:206: manual] Error 2

Sorry for the long and tedious text, I prefer circumstantiating the problem to save time.
Thank in advance

Sorry for that, there was a problem in the build process.

Please try to download again and re-install.
If you used the automatic installation via the repo re-install the new public repository key “flair.gpg” again as it shown in the download instructions