Get rid off- *EXPIRED CERTIFICATE *CERTIFICATE ERROR *Unable to install protected application from an untrusted supplier *Unable to install. Constrained by certificate. You will need two software for this, so download them first...
1. Xstevedore signed.sisx
2. Free signer signed.sisx
After downloading xstevedore install it first, Then open it if it doesn't automatically open after installation. Its in chinese language so please compare with this

Step 2¨C Open the Application and browse on to the last item on the screen! It is "settings"

Step 3¨C In this caption you will find these options : 1. Access point 2. Download path 3. Quit tips Option1: Change access point which you want Option2: It is recommended to change download path to memory card

Step 4- Now go to the second last option It is "signature" caption. Then go to options and u will find four options : Choose second option which is "certificate tool".

Step 5- After that again it will show two options. Choose second option which is "a button to download ".

Step 6- Then downloading will start automatically

Step 7- Then it will ask to save.
Then select memory card.
Its Done. Your Certificate and key files are downloaded and are saved in memory stick.

NOW install FREE SIGNER And open it go to option>setting>self sign cer and browse your cert where you have just downloaded it>press OK Again repeat it with self sign key also>browse key >OK You can solve problems like 1. Certificate error 2. Expired certificate 3. Unable to install protected application from an untrusted supplier 4. Unable to install. Constrained by certificate. (For problem 2 and 4, first REMOVE SIGN using freesigner and then SIGN SIS )