I'm having trouble trying to upload a zip file Wordpress theme that I bought from Themeforest. I'm getting an inactive "upload theme" button, I have tried to reinstall the Wordpress theme three times now, but I'm having the same problem. I also tried uploaded the theme through FTP to "content" folder, but this did not solve my problem. This started when I upgraded to Wordpress 4.3.1. I'm I missing something here? please advice.
I had the same problem, this link explains how to change your filesize upload limit https://www.digitalocean.com/community/tutorials/how-to-change-your-php-settings-on-ubuntu-14-04
Basically find your php.ini file, and change these two below to 30M
post_max_size = 8M upload_max_filesize = 2M