If you experience this problem in Dewesoft, it is because the files packages.pc and options.opt are not in the Dewesoft system folder. The problem usually happens if you don't  make a clean installation of Dewesoft into a new empty folder.

There are two solutions to fix this issue:

1. Reinstall Dewesoft in a new empty folder 

2. Find the options and packages file on your computer and copy them into the system folder that Dewesoft uses. They can usually be found in the Documents folder or the public document folder (e.g. C:\Users\Public\Documents\Dewesoft). To know which system folder Dewesoft uses go to "Files and folders" in the settings, there you can find the system folder location.