There was a download of Castlevania 1.35 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The program lies within Games, more precisely Adventure.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
The Castlevania installer is commonly called C.V.EXE, Castlevania.exe, CastlevaniaLoSUE.exe, CLOS2.exe or nestopia.exe etc. The most popular versions among Castlevania users are 1.3 and 1.0. This software is an intellectual property of Konami Computer Entertainment Tokyo, Inc.
From the developer:
Castlevania is a third-person action-adventure game in which the player controls the main character Gabriel Belmont.The combat involves a retractable chain whip called the Combat Cross. The player can perform up to forty unlockable combos with it. The commands consist of direct attacks for dealing direct damage to enemies, and weak area attacks when surrounded by them.
You may want to check out more software, such as Castlevania: Lords of Shadow - Ultimate Edition, Castlevania: Lords of Shadow 2 or Castlevania The New Generation, which might be similar to Castlevania.