Go to thegithub site of the project and download the EXE or MSI.
Run the downloaded file and click on “Install”.

If the machine has a ID already stop the RustDesk client UI (close the program) and the service:

net stop rustdesk

Open the file 'C:\Windows\ServiceProfiles\LocalService\AppData\Roaming\RustDesk\config\RustDesk.toml' with notepad++. Replace the content with:

id = 'own-id'
password = ''
salt = ''
 
key_confirmed = false
 
[keys_confirmed]
rs-ny = false

Restart the service:

net start rustdesk

The Rustdesk UI will show the changed ID.