I have one remaining question: what are the limitations of the demo version ? Is there a time limit, as well (if so I’ll only download it at the right time!)
Well, there are no limitations on the trail version as per the functionalities are concerned and you can use it to test your requirement as long as you want. However the trial version will add an evaluation sheet with every generated workbook. Please see the following documentation link for details about trial / evaluation version.
Well, the evaluation version of Aspose.Cells product (product without a valid license (temporary or permanent) specified) provides partial product functionality, it is limited to open/generate 100 files in one program and an extra worksheet with evaluation watermark. Secondly it may not provide you the feasibility to use all the APIs the product can support. But there is no limitation upon evaluation, you may use the product without the valid license as long as you wish.
Moreover, when you subscribe or when you purchase the license for the product, you are eligible to use versions / bug fixes of the products that are released in the next whole year as free.
Have a good day!
Feel free to contact us anytime if you need further info.