Install button doesn't work

Development Getting Started & Setup
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1

I missed two lines of log.

After that 4 logs, below lines are added

[2019.07.19-02.00.03:872][698][0000016961267600] FWebPurchaseCommand::PurchaseComplete - Setting state NotStarted
[2019.07.19-02.00.03:872][698][0000016961267600] FWebPurchaseCommand::NotStartedState

2

Hello

I have a problem that install button doesn’t work in Epic Games Launcher.
When I click the install button, nothing happened.
I already run the Launcher as the Admin. and re-installed the Launcher.

Below is the log when I clicked the install button,

[2019.07.19-02.00.01:218][585][0000016961267600] FWebPurchaseCommand::ExecuteInternal - Setting state VerifyItems
[2019.07.19-02.00.01:218][585][0000016961267600] FWebPurchaseCommand::VerifyItemsState
[2019.07.19-02.00.01:218][585][0000016961267600] FWebPurchaseCommand::QuickPurchaseState
[2019.07.19-02.00.01:912][626][0000016961267600] FWebPurchaseCommand::HandleQuickPurchaseComplete - Setting state VerifyPurchase
[2019.07.19-02.00.01:912][626][0000016961267600] FWebPurchaseCommand:VerifyPurchaseState

After the last line, nothing happened.
How can I solve this problem?