It seems the downloaded file is versioned, that's why it keeps showing the new version notice even after redownloading it. Please run these commands to fix it:
sudo unlink /opt/bitnami/bnsupport-tool
sudo ln -s /opt/bitnami/bnsupport/bnsupport-linux-x64.run /opt/bitnami/bnsupport-tool
Then finally run it with:
sudo bash -c "TMPDIR=$HOME/tmp /opt/bitnami/bnsupport-tool"
As a side note and I mentioned previously, there is a chance that, even obtaining the support bundle, we may not able to figure out the original cause of the issue. In any case, I believe it is worth it to ensure you are able to generate this kind of bundles, as it would ease the process in any future issues that you could have.