You can try to install AdoptOpenJDK yourself and then run the Studio Pro installer again:
Here is a link to the 64-bit Windows version of AdoptOpenJDK 11 which is what you need for Mendix 8:
Install at least Mendix 8.1.0 (8.3.0 is even better!) after this because Mendix 8.0.0 did not like it if you installed AdoptOpenJDK manually and it was newer than the version it expected.
+1 to Arjan’s solution.
If you have problems with the installation, also see the Troubleshooting section of the `Install Mendix Studio Pro` documentation https://docs.mendix.com/howto/general/install#troubleshooting