What folder are you trying to import? If it is the hole themeforest-11941335-tower-businessdriven-multipurpose-wp-theme-wordpress-theme.zip file, then you are importing the wrong file. First unzip themeforest-11941335-tower-businessdriven-multipurpose-wp-theme-wordpress-theme.zip and find inside the “tower” theme folder. Zip it and upload from your dashboard.
If it still cuts off before 100%, then increase your memory limit. You can do it yourself or ask you hosting provider to increase it for you.
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