Change the values of the User Agent registry entries from Internet Explorer (IE) to Chrome. This change will bypass the Dropbox server-side check of the non-supported IE browser.

Do the following:

1. Open the registry editor –  go to Run (Windows menu + R), type regedit.exe in the Open field and click OK.
2. Go to the following location in the editor:
   Computer\HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\User Agent
3. In the right frame, double-click Default and enter the following in the Value data field and then click OK: Mozilla/5.0
4. Add the following keys of type String Value:
   1. Right-click User Agent, point to New and then click String Value. A new key is added in the right frame. Rename it to Platform. Double-click Platform and enter the following in the Value data field and then click OK: Windows NT 10.1; Win64; x64
   2. Right-click User Agent, point to New and then click String Value. A new key is added in the right frame. Rename it to Version. Double-click Version and enter the following in the Value data field and then click OK: AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.106

The newly added registry keys under User Agent should look like as shown in the snapshot below.

    e. Close the registry editor.