Betheme not possible to unzip im wordpress



Yesterday I bought the theme BeTheme.
After downloading and unzip the main fail I try to instal the zip file “betheme” with wordpress, nur I got only the massage that the theme is during unzip. I have try it several times. I have try to instal the theme “betheme child”. That works without problems, I only got the massage that I have to instal the parents Theme steht first.
I downloaded some free themes. All themes I can instal without any problem.
At the last time I let “unzip” the theme “betheme” more than 8 hours, but it doesen’t work.
What can I do?

(Sorry for my bad english)