No, you won’t be able to download all the contacts to your desktop.
However, you can bulk import all your contacts into the system by clicking on the 'Import Contacts' button. Then, download the sample import file and fill in the fields stated in the sample import file.
Once done, browse the sample import file you've saved and uploaded the file onto Deskera's CRM system. You'll see all the names of contacts you've created on the contact lists.
Save the sample import file on your desktop in case you'll need to use it in the future.