Session Start errors, no CSS

[newbeeman]

Unzipping a clean set of files is often a good starting point. Then merge your customizations into those files so you have a full working set. Then you have a test site for doing development/testing on before going to the live store.

OK, but it's not going to achieve what I need to do. I originally loaded the ZC on my local machine, then my ISP made me work online rather than upload a developed site. This caused me to work very quickly and I failed to use the Overrides. Now I want to correct the errors on my machine, upload, then upgrade. I cannot risk screwing up a valuable busy web site.
Incidently I used Filezilla to download the catalog site!!
So the question now is. How can I get my remote site down to my machine so that it works correctly?
Could I install a new copy, then copy over the necessary files to overwrite with my working files? But if I did, then I might still get double spaced files again!
I really need some help here as I'm getting out of my depth.

[newbeeman]

I really need some help here as I'm getting out of my depth.

Hey I'm not such a clutz as I thought, I've fixed it.
Not sure if it will apply to the whole site as it's quite extensive.
I checked each error, copied and pasted a 'new' copy of each file and refreshed each time. There were a number of files, but eventually I got out to the log out page.
Further testing might reveal more errors, will keep you posted.
Many thanks for the help and support.

[newbeeman]

Just an update. The above methods worked. I now have a copy of my remote site running successfully on localhost, allowing me to correct the errors I made years ago.
Thanks to all who helped.