Scribus open source desktop publishing and page layout software uses both .scd and .sla for it's documents, so if you need to convert one to another, you need to download and install Scribus. Unfortunately, we couldn't find anything specific about scd to sla conversion.
Convert Scribus document to Scribus document file.
We found one software available in the database for this conversion.
Microsoft Windows software - convert scd to sla on Windows
An open source page layout software
Convert from scd file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.