Backup your Trainz install to another place. Install the SP1 and the two hot fixes.
The update process takes a very long time, but let it finish and run any database repairs requested. I ran an EDR afterwards to ensure that any errors I had were real errors. It turned out they were real and the stuff had to be repaired.
What kind of errors does CamScott's have?
If the models are missing thumbnails, this is easily done by creating a thumbnail and tag. Other problems are also easily fixed like mode 2 or mode 1 have to be changed to mode day or mode night. There are a few other config typos, but they're also easy to fix. Read through the TS2009 - Wiki for the CCG. It lists the parameters for all of the tags used by the config.txt files.
John