Hopefully it's not me, but the latest trainer download seems to be missing the .exe file. I tried downloading it a couple of times, and it just contains the 2 .txt files.
It's your browser/security software blocking it. Whitelist cheathappens.com for browser security and/or download it to a folder that has been set to be excluded from whatever security software you use. Link
When I use the Unlimited c-bills option after awhile I get a negative balance of minus 202,000,000,000 and I can't buy anything and will be bankrupt in a month?.
This is a limitation of the game, and has been since the initial release. No idea how to fix it, but it's not a bug caused by the trainer.