Thanks for your posting your valid concerns and considering Aspose.Cells.
Please note Aspose.Cells in Evaluation mode has almost full, more than 90%, functionality as Aspose.Cells in License mode. Evaluation mode just creates an extra worksheet containing the evaluation warning and that’s all. So whatever functionality you find in licensed mode, you also find it in evaluation mode.
However, Aspose also allows you to use temporary license to evaluate Aspose APIs like Cells, Words, Pdf, Slides etc which you can get from Sales team. Please do post your query in Aspose.Purchase forum and acquire the temporary license from them. It will be valid for one month only.
Aspose.Cells only relies on .NET Framework. It does not need Microsoft Office or any Interop things for working. The only dependency is .NET Framework 2.0 or more.