Error installing component

I have purchase the vQuiz component but i can't install it.

I have unzip and when im going to install extensions i choose pkg_vquiz_v2.5.0.zip but i get the next error:

Warning

JInstaller: :Install: Can't find XML setup file.
Table 'formacionvet.#__vquiz_quizzes' doesn't exist SQL=UPDATE #__vquiz_quizzes SET `created_by`= '758',`created_date`= '2017-02-03 21:02:38'
Package Install: There was an error installing an extension: com_vquiz.zip

Error

Error installing package

Hello,
Please share your backend & FTP login credentials via Contact us form, We'll look into it.

I have send you an email to s*****@w***ech.com with the information

Thanks

The component wasn't installed correctly, We have now reinstalled it, Please check. An email has also been sent to you.

The Component is Ok and running with our first Test, but when i've installed de module "MyResults" for the users can consult their results... show "No Results Found" (obviously having the test finised)

¿Other way to get de final snap with correct and incorrect answers by the users?

Thanks

Hello,
My Results module is used to display logged in user's results only which can only be seen by the user itself. And It doesn't display the correct/incorrect answers for each question. It just display your result score from all the quizzes you have played. Are you using it for the same purpose? The detailed result can only be seen in My Result section on Quiz Dashboard in frontend which is accessible to logged in users only.