I used this guide which worked perfect to install Catalina:
http://www.itayemi.com/blog/2020/04/17/installing-mac-osx-10-15-catalina-on-hp-elitebook-folio-9740m/
At the part when u are able to login into catalina, you can use the HP installer.
I wasn't able to select any hp machine as my HP 650...
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