Please review the release notes for supported upgrade paths to 11.5 - https://www.cisco.com/c/dam/en/us/td/docs/security/wsa/wsa11-5/WSA_11-5-x_Release_Notes.pdf     Currently, there is no upgrade path from 10.5.3 > 11.5.1 

Please review the release notes for supported upgrade paths to 11.5 - https://www.cisco.com/c/dam/en/us/td/docs/security/wsa/wsa11-5/WSA_11-5-x_Release_Notes.pdf     Currently there is no upgrade path from 10.5.3 > 11.5.1 

Release date for 11.5.1 to support 10.5.3 upgrade path has been pushed back. Please monitor the release notes for a release path to be added for 10.5.3 in the coming weeks.

I discussed this with WSA developer team. The upgrade path from 10.5.3 to 11.5.1 , will be available within two weeks.    Keep an eye on the release notes as it provides upgrade paths to 11.5.1 -  https://www.cisco.com/c/dam/en/us/td/docs/security/ws...

Hello!    For WSA upgrade paths from 10.5.3 > 11.5.1, there currently are not any currently because 11.5.1 was released before 10.5.3 (both were released within 2 weeks ago). I have submitted a request to WSA Product Management have it added ASAP.   ...