@tig said:

The signature-file name contains text warning you not to delete it.
BUT you must delete it if there are problems with its configuration.

It's rebuilt to suit the latest set up after redoing the licenses...

Your "The count IF exited" quote is not easy to understand,
Perhaps it's a problem because English is not your first language ?

Is there anything odd about your computer's name ?
It should follow the Windows naming recommendations... e.g. no special or foreign characters - this might therefore confuse Ruby when it reads/saves the data ?

Yes, my computer name was originally in Chinese, I changed it to English and it was resolved, thanks for your help.

@tig said:

The error message shows that the signature-file is invalid, usually this is because you've renamed your computer.
It suggests that you erase the signature-file.
It asks if you want to open the folder containing the file.
If you answer Y[es] the folder opens and you can erase the file.
Then you need to reset the license[s] under the Tools > Fred6Collection submenu for that extension > License..., which will then make a new signature-file using the current computer's details...

I deleted it, but it still doesn't improve when it rebuilds the signature file, "The count IF exited" is always displayed in "SCFLicenseSignature - DO NOT MODIFY OR DELETE"

我無法裝入我的許可證，它一直顯示我更改了電腦名稱，我已經刪除signature文件無數次仍無法解決問題

How should I fix this? I've tried redownloading curviloft and my license countless times.

How should I fix this? I've tried redownloading curviloft and my license countless times