I depends on how you run the script.
See https://winscp.net/eng/docs/scripting#configuration
It is better to explicitly set it in the script. The very link I have posted above shows how.
https://winscp.net/eng/docs/ui_pref_resume#temporary
https://winscp.net/eng/docs/scriptcommand_get#resumesupport

Thanks for getting back to me Martin.
Would disabling the setting in the UI also affect scripts or would I have to add specific syntax to my scripts?
I only say this because I use scripts for everything and not the UI.

This issue has been added to the tracker:
https://winscp.net/tracker/1922

Your file has a name long 252 characters. When WinSCP is downloading the file it adds a temporary suffix ".filepart", with which the filename length exceeds system limit.
Disable the transfer using a temporary name to workaround the problem:
https://winscp.net/eng/docs/ui_pref_resume

Hi,
I am experiencing a system error in my logs where it is not downloading all the files from an SFTP server.

I have attached the log; errors are at the end.