I have a VM that I use to do all my ThinApps, Once I have done my application and its built I copy just the bin folder to a server which has a share, I then create a shortcut to the program exe on users desktops. This all seems to work ok. Firstly is this correct? If so, how then do I apply a service pack to that application after the ThinApp VM has been reverted to a base image, I have corel draw which i have a service pack for but it wont intall it as its saying it cant find the package installed on the computer. I have Thinreg batch file so have included corel into that and the program appears in the program list. I have the sandbox redirected to the server share mentioned earlier into seperate user folders when the user logs in. Obvisouly once i have done a App I revert to a previous snapshop so my thinapp vm is back to base image, so the corel install is lost. Sorry if im missing something very simple. Is its a case if you have an exe/msp you have to reinstall the whole app again and start over, Thanks for any help.