Update ClickOnce Version by Replacing Deployment Files with New CU files

Hi,

how do we update the clickonce clients?

Right now we have clickonce packages on a server xxx.yyy/customer/clickonce/ClickOnceDeploymentFiles/ ...

We know we need to make the new client files available, So that when the User open his ClickOnce the Client will be updates to the new Version. but how?
What I tried till now (2 different ways):
First Way:
- I replaced the .../Deployment/Applicationsfiles folder with the neu CU deployment Files. But I didn't replace the manifest!
- I also updated the manifest version No. with the new Bulid no.
- Also I made the required minim version to be 9.0.0.0



Results:
When the user open his click once is starts normally & nothing happens




Second Way:
I made a new installation for the new Bulid + I renamed the new Folder to have the same name like the old deployment folder + I deleted the old Deployment folder!
Results:
When the user open his click once it gave back an error & it cannot start the client, I have to install ClickOnce then it will work! --> I want to avoid this


So can anyone tell me please how can I make Clickone to update it self once the user open it? We have almost 50 user which uses clickonce, I donot want to make a new deployment! coz if i did so i have to deinstall the old client and reinstall the new client on 50 Pcs.