The program update for version 5.5.195786.1382 is a two step process

[Citizen_K]

For people updating from v5.4 to 5.5 using the program updater:

@egemen post:1

Please note, you will be receiving 2 updates. The first update is going to update the binary updater which is capable of updating version 5.4 clients to 5.5.

After both the first and second update the computer needs to be rebooted.