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You might want to change the ‘Terms and Condition’ because after activating using the key, you only get free updates until 31/12/2017 and strictly for non-commercial use only.
[@Doris]
Hi Doris,
The ZIP archive usually isn´t password protected. Please try to use to download the official archive from here: https://flowheater.net/en/download.
The activation ill works also with this version.