[Closed] Can restore only some baught non-consumable IAP items.

I am using Unity IAP Plugin. I have problem on restore only some IAP item.
Details are as follow.

1.) I have about 10 non consumable IAP items. First, I can restore all these items.
2.) I add comment to the following line that add product in InitializePurchasing()
- builder.AddProduct
3.) Run this app on android one time. Then remove comment from the same line,
And run the app again. Now I can not restore any items.
4.) Click to buy 3 more items from my app. Then reinstall the app on android device.
5.)Run the app, now I can restore only newly 3 items just baught in step 4. The old
10 items that have baught before add comment to that line can not be restore at all.

How can I restore all those 10 items that have baught before I add comment to
builder.AddProduct line?

PS. I put restore code in ProcessPurchase() module. And all 10 and 3 items are non consumable items.

 

I have clear google app catch and my app catch already. But it can not be solved.

 

This is my c# script for purchasing. It include all functions and procedure
for dealing with IAP.

 

Or if you need the project file, I have created a simple test project
for you to investigate. You can download from the link below.

http://www.web1081009.com/temp/SpaceWords7050.zip

 

Can you download the zip file?