The latest version released is WTOS 22.214.171.124, version 126.96.36.199 is the latest version released (for the 6.5 series) but not the latest version with all the hot fixes (not sure but it could be 188.8.131.52).
If you have a maintenance contract you can download this version, if you don;t have any i would advise you to have one (it’s very each).
aLIE is 100% correct. The latest release versions are
But there are already hotfix or demo releases available.
But I doubt you can get your hands on these versions without a maintenance contract.