This is not a error we are aware of at this time. A missing .dll would indicate a corrupted download so my suggestion would have been to do as you have already done with the reinstall.

Please try uninstalling, delete the install directory, restart the machine, reinstall through Impulse, restart again to clear the cache and see if that does it for you. If not check to see if you have any security software running that could interfere with the download/install. This is a remote possibility but one to check on anyway.

I can't run entrnechment. I get this error. fmod.dll can't be found. I uninstalled  / reinstalled and same effect.

i got that too, i uninstalled and redownloaded it and it started up fine

im getting a "cannot create sdactivate.log file. Do you want to create a new one?"

I am so lost on what to do....

and Sins is no longer showing up in my "my games" tab.

I installed Entrenchment and now it doesn't start at all.  All I get is a blank window

Make sure that when you post the debug log that you are getting the debug.err file from the game directory right after that error you get. That way we can be certain it is the up to date information on the problem. Also if you have the expansions installed the debug you need is in the expansion folder you are currently updated/installed to.