I just went through something similar.
To activate the CMS on the server, make sure you use the passcode given to activate your PowerCMS extension.
You may also want to check that you have the SQL database access to external read/write.
Also, check your servers...I switched my GoDaddy Acct to be both, my upload and remote server, which solved similar issues with the errors and allowed the program to upload with no problems.
Here's the caveat...I'm a novice. So, take my post with a grain of salt. Support took too long to get back to me.