Registering Asset- trial was on the Beta 6.3

[Floyd]

I bought two Synology Asset licences.
I was running my trial using the Asset 6.3 Beta.
How do I now register as it appears that it can't downgrade to the Asset 6.2 version
which is what it tries to instal after purchase..
Or have I missed something?
Only 1 day to go on the trial version.....so hopefully someone can help me.
Thanks