ISO – LTSC. LTSC is a long term support channel, which will be supported for a longer period of time. Select Windows 10 Enterprise evaluation ISO file type. Fill in the evaluation form, which includes your name, company name, company size, job title, work email address, work phone number, and country. Under the "Device" section, select the USB flash drive. Under the "Boot selection" section, click the Select button on the right side. Select the Windows 10 ISO file from the folder location. 1. Visit Microsoft's ISO download site using a Mac or Chromebook. 2. On Microsoft's download site, select the Edition of Windows 10 that you want to download and click on Confirm. 3. Select Language and click on Confirm. 4. On the next screen, select 32-bit Download or 64-bit Download as required for your computer.