decrypt aes256 encrypted file without gpg-agent

[Fourhundred Thecat]

 > On 2020-06-29 14:42, Dmitry Alexandrov wrote:
> Fourhundred Thecat <400thecat at gmx.ch> wrote:
>> I am protesting the fact, that gpg can no longer be used without the agent.
>
> Yet you have not described the reason behind it so far, have you?  Why are you sure, that the issue, that make gpg-agent fail to start in your case, is hard to resolve?

I don't have gpg-agent installed, on this particular server, where I
need to decrypt one file.