How to do document conversion using trail version of Aspose.Words for .NET

Hey,
I have an account from RChilli for Document Conversion. Currently we are using version !4.4.Now, I want to update the version to 20.8 for testing, because I am facing issue for Chinese Document Conversion i.e. they are taking more time than usual .

When I updated the version, It is showing me below error:
The subscription included in this license allows free upgrades until 16 May 2014, but this version of the product was released on 01 Aug 2020. Please renew the subscription or use a previous version of the product

Kindly suggest next step for testing.

@RChilli_Nidhi

Your license does not allow to use the latest version of Aspose.Words. You can check the expiry date of your license by opening the license file in notepad. You will see the following tag in your license file:

<SubscriptionExpiry>20200925</SubscriptionExpiry>

It means that you can free upgrade to a version of Aspose.Words that is published before 09/25/2020. We suggest you please upgrade your license by contacting our sales team.

You can also get the 30 days temporary license to check your scenario.