If your SkinBrowser is saying its expired then chances are you are experience 1 of 3 problems.
1) Your WinCustomize account does not recognize that you have purchased a subscription because you purchased under a diffeent email account. You must cross reference your account to the email address that you used to purchase the subscription (or if it was changed to that email address). So if I logon to Wincustomize with a stardock.com account, and I have purchased WindowBlinds with a hotmail.com account and I have purcahsed the subscription with a comcast.net account then I need to cross reference to the comcast.net account in order to find the proper information for your subscription. So make sure you are referenced to the correct account.
2) Your Wincustomize cookie has not been updated and does not contain the expiration date as it was just recently added. To correct this do the following:
a: Logoff WinCustomize
b: Delete your wincustomize cookie (optional but recommended)
c: Close all instances of your your browsers (ie) and skin browser
d: Open Wincustomize or SkinBrowser and logon
3) You are using an illegal version of SkinBrowser