The academic edition of most software is sold to allow you to learn the system and commands. It is not sold for doing production work. There are reasons they have eliminated the import/export of files from other sources as those functions are usually associated with production work and not learning the software itself. While there are nuances to doing imported file work, they leave that for the fully licensed version of the software. The watermarks on the drawings is another thing the vendors put in the software so production drawings cannot be produced on an academic system. I know some vendors who also modify the file header so files created on the academic system cannot be opened in a commercial system.
You are paying a significantly reduced price for a CAD system that will allow you to become proficient in utilizing the user interface and learning the workflow process to create designs in a productive manner.
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