For down grade I would like you to remove qlikview server from control pannel and remove all the entries for V10 and as well as V 9 from registry. In order to avoid version confliction.
Later as your licenses are concern Its not an issue.
You don't have Named user cals Instead you have document cal and session cal.
In order to make use of Document cals just follow the steps mentioned below.
1) give proper authorization permision on document via NTFS or DMS what ever mechanism you follow
2) go to qemc --> documents tab --> user document --> select an application
then to the right pain go to tha tab called Document's CAL, in the section Number of cals allocated to this document
enter the number of users you wana give access to this document.
suppose 5. then enter 5 in this field.
select the checkbox allo dynamic CAL assignment ---> Apply
Restart the qlikview related services.
Now try to access the document.
I'm sure this will definately gona help you out.
If you still have any difficulties fell free to ask.
Hope that helps
I had some difficulty downgrading to v9, but with some help from the community I was eventually successful.
Here's the link to another discussion... http://community.qlik.com/message/105708#105708