Document Format.openxml version in K2 5.3

Hi  @kathija 

I did some reseach and I think that it uses versoin 2.5.

From link of a known issue they provided a workaround to slove the problem. In the workaround there is a link to install openxml and the version there is 2.5

Have a look at the following links:

1.known Issue

https://help.k2.com/kb002502

2.Open xml sdk for microsoft office 

Best regards

hulisani