Best answer by VikramK
Welcome to the forum and sorry about the late response.
You don't have to transfer MyDrive as its a web application. Just find the link to the website here
If you want to install MyDrive connect application then please download it from the link- https://uk.support.tomtom.com/app/answers/detail/a_id/12428
On your new computer download and install the 'Tyre' software -> In Tyre, go to Tools > License, enter your username and activation code via copy/paste.
Hope this information will help.