For the v-key error, it says:
Self-voicing is enabled. Press 'v' to disable.
The error appears right after the opening movie, even in the main menu where you select to continue, new game, load game, etc. When I re-downloaded the game, I tried to run it with the old saves but presented the same error, so I extracted the folder again but without adding anything, just "vanilla" game, but presented same error, so it seems it's not something from the save data.
On the pop-up error I have this error (it's a link to imgur of a screenshot of the error). Sorry it's in spanish.
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Before sending this message I tried some stuff and didn't work out anything, but on the "vanilla" version I mentioned the error was from the very beginning, so I pressed 'v' key, error poped up, closed and pressed Ctrl+V and seems to have solved the issue. Only thing is when I clicked on continue in the vanilla version it continued from where I left it on the first one, so it's kind of weird. On the save folder there's a "persistent" file and that might have something to do with that? Dunno, but I'm happy I can play this game again, although I'd like to know where that data is stored in.
Sorry for the long post, and thanks for everything. If you have any doubts I could provide with more information if needed.