Oh man...this sounds similar to turbo tax online...when I filed my taxes for last year, at the end of the process I upgraded to the next level which was of course more expensive. Then the upgrade did not really help with the return and I decided to downgrade back to the standard personal level...but..oh no...I could not downgrade at all..WTF...and their site says once you upgrade you cannot downgrade...that's a boat load of whatever...but I would never imagine LinkedIn doing something similar...the error is probably temporary..
IMHO the purpose of MS should not be to find a better job or to get a raise. You have already proven that you are an Entrepreneur therefore it would not be too difficult for you to start where you left off after a year. You can never go wrong with education and investing a year of your time will only make you a better decision maker.