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
I recommend uninstalling all the other themes from THEMES folder and add the zip file using ftp.
Hope this helped you.
It is often due to the fact that the zip not only contains the theme but also the documentation, readme, photoshop files, , …
You should uncompress the zip file and extract only the zip of the theme. This is the file that has to be uploaded in wordpress.