Is the game dead? No.
Despite long periods of silence, JKB sporadically releases "Devlogs" (development logs) and trailers that show significant progress. Recent videos have showcased:
The developer has stated that the game is "feature complete" regarding the engine, and the current work is focused on content creation—making the levels, enemies, and cutscenes for the full story.
When the game eventually releases, it will be free. The developer has promised it will be a free fan project.
To get the legitimate file when the time comes:
The most important thing to clarify for anyone searching for a download link is this:
Mega Man X: Corrupted has not been released.
Because the game is still in active development, there is no ROM file, no patch, and no playable demo currently available to the public.
If you find a website claiming to have the "Full ROM" or a "Beta Leak," proceed with extreme caution. These are almost certainly:
It is heartbreaking to see fans excited to play this masterpiece, only to have their computers compromised by fake download buttons. As of now, the only official source for the game is the JKB Games YouTube channel, where development updates are posted.

