I have some problem with CSVI + VM addon. After installation, I don't see the "virtuemart" option anywhere. I checked other posts, but I found no solution (yes, virtuemart is installed

These are system details:
Joomla! Platform Version 3.4.8
PHP Version 5.5.33
VM 3.0.12
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CSVi 6.5.4
CSVi Virtuemart 6.5.4
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(no errors on installation)
When creating a new template, I cannot see on the list the "virtuemart" option.
And when installing templates examples, "virtuemart" examples are not installed neither.
(no conflict with plugins detected)
When trying to enter the "Download ID" I also get this...
Error Could not save data. Error:
I have tried to uninstall following instructions (first, with maintenance command, clean all tables, and then unistalling) and I got this:
Message
Uninstalling the plugin was successful.
Uninstalling the plugin was successful.
Uninstalling the plugin was successful.
Uninstalling the component was successful.
Error uninstalling .
Error uninstalling .
Error uninstalling .
Error uninstalling .
Error uninstalling .
Uninstalling the plugin was successful.
Error uninstalling .
After this, I tried to install everything again... but no difference.
Any idea about what to check?
Do you want any log information?
Thank you!
