Wordpress theme upload error PCLZIP_ERR_BAD_FORMAT

One of simple alternative is to download theme package, upzip it and upload through FTP whole theme folder into

/wp-content/themes

Then go to Admin CP and switch to new installed theme.

please check that only those file are here that you wan to upload. i was getting same problem, then i search on folder, there was already zip folder in it. after uploading that zip file. the problem was solved. Now the themes is activated.

This error due to you are trying to upload Other than ZIP Compressed version. Other format is not supported while uploading the plugin in wordpress.

You should unzip your plugin and make sure you compress with ZIP format and upload it will be working fine.