Digital Ocean for Ubuntu and Putty

  The Ubuntu version of **16.04.5 version is not available**. When I click the URL in the below description, it shows error. So **I install the 16.04.6 version**. Is it okay? 
   When I install putty it does not pop on the screen as shown in the **Accessing**. So is there any alternatives methods to the putty software. Kindly send the link for **Ubuntu 16.04.5 version**.