I cannot install Newspaper theme

I just purchased a newspaper theme and I tried uploading it but it showed “please try again”. Then I tried uploading it via FTP but their some files failed to upload. I just need the solution for this as soon as possible.
This is the system status shown in Newspaper:
Theme config
Registration key i themenull.net Reset key
Theme name i Newspaper
Theme version i 8.5.1
Theme database version i 8.5.1
HTTP channel test wordpress
Installed demo i Tech News – demo ID: tech | install type: no_content
php.ini configuration
Server software i Apache/2.4.27 (Unix) OpenSSL/1.0.1e-fips
PHP Version i 5.6.30
post_max_size i 8M – You cannot upload images, themes and plugins that have a size bigger than this value. To see how you can change this please check our guide here.
max_execution_time 30 – the execution time should be bigger than 60 if you plan to use the demos. To see how you can change this please check our guide here.
max_input_vars 1000 – the max_input_vars should be bigger than 2000, otherwise, it can cause incomplete saves in the menu panel in WordPress. To see how you can change this please check our guide here.
SUHOSIN installed false
mbstring available
WordPress and plugins
WP Home URL i https://vinstechs.com
WP Site URL i https://vinstechs.com
WP version i 4.9.1
WP multisite enabled i No
WP Language i en_US
WP Memory Limit 256 MB/request
WP_DEBUG False
Caching plugin WP super cache – for best performance please check the plugin configuration guide here.