Import Prebuild websites doesn’t work

Hello, I’m trying to intall a prebuild website but it blocks at 15%.
Then I get this two messages:

Something is wrong with the import and it can’t be complete. Try to disable all external plugins and run the import again. If it doesn’t help, contact our support center for further assistance.

AJAX import error. Try to disable all external plugins and run the import again. If it doesn’t help, contact our support center for further assistance.

Could you help me?
Than you

Hello,

Thank you very much for choosing our theme and for contacting us.

Please insert the site admin access into the Private content below the message area. We will take a closer look at the case.

Best Regards

[Author]

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