Hi Dwi Wicaksana,
Can you please let us know about the following:
- Do you have download issues when you upload zip file to the file system
- Do you see any errors in the Sitefinity.log file, when you request a zip file uploaded in the Images and Documents module
- Does the problem persist when you Uncheck enable dynamic content compression in IIS.
Thank you for these details in advance!
the Telerik team