Is it permissible to use non-free computer programs for which the producing company has ceased support and removed them from its website?

Copyrights belong to the software producer and inventor, so the company's terms and conditions must be considered. If the company has removed the software from its website and no longer supports it, there is no harm in benefiting from it. However, if the company's prohibition does not affect the value of the software, it is not permissible to use it without the company's permission.