Updating Bookify is relatively technical so make sure to do it correctly and as explained in documentation to avoid any unwanted result.
Download latest version of Bookify from Codecanyon. Extract the files somewhere in your computer. After that, extract bookify.zip also.
Once Bookify.zip is extracted in your computer. Select css, js & plugins folder and compress these three. Once you have compressed them, go to your hosting files and remove these folder from there.
css folderon your hosting.
js folderon your hosting.
plugins folderon your hosting.
Once you have done that, upload the three compressed folder and extract them.
Now we must update source code. From the Bookify files on your computer, select
Compress these five folders in a zip. After that delete those folders from your hosting files and than upload new from your computer that are in a zip. Upload the zip inside application folder and extract there.