Hello  @RoySun ,

Thanks for posting your query here. Please note that the latest update released for K2 5.3 is K2 Five (5.3) April 2020 Cumulative Update Fix Pack 9. You would need to first install the K2 Five (5.3) April 2020 Cumulative Update before the Fix Pack 9. You may download the respective updates from the links below:

K2 Five (5.3) April 2020 Cumulative Update:

https://portal.k2.com/product/k25-3april2020cumulativeupdate

K2 Five (5.3) April 2020 Cumulative Update Fix Pack 9:

https://portal.k2.com/product/k25-3apr2020cufp09

Cheers,

Kimberly 

K2 will not accept any liability for any issues arising from actions taken in respect of information provided by any forum member.