To make sure your upgrade from Denodo 7.0 to Denodo 8.0 is smooth and complete ,I would recommend you refer to the following documents of the Denodo Platform Upgrade Guide :
* [Preparing to Upgrade.](https://www.google.com/url?q=https://community.denodo.com/docs/html/browse/8.0/en/platform/upgrade/preparing_to_upgrade%23preparing-to-upgrade&sa=D&source=docs&ust=1637151267109000&usg=AOvVaw3mzTeGDlSp1XgR5vT-Myu-)
* [Pre-Upgrade Tasks for the New Installation.](https://community.denodo.com/docs/html/browse/8.0/en/platform/upgrade/pre_upgrade_tasks#pre-upgrade-tasks-for-the-new-installation)
Regarding your next question. Yes, you can install the Denodo Platform version 8.0 in the same physical machine where the current installation of the Denodo Platform 7.0 is running, but it has to be installed in a different directory.
It is also possible to run different versions simultaneously, To do that configure the new installation to use different ports to listen to connections.
Hope this helps!