My machine defaulted to Mavericks as the downloadable version (10.14.5). The problem with this is that the encryption is so old, that after it boots, it can't talk to the apple store (bad password errors). This was a helpful link to install Catalina without the apple store: https://wccftech.com/how-to/how-to-downl... The installer isn't apple but it pulls the OS from apple. Once this installs, iCloud and the store will work as expected.