Is it possible to easily setup a launch condition that checks if another
product is installed on the system?

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? Firstly ,I descript the function steps installer.

1. We must check? lisence is installed before the installation of? application.
2. if lisence is ?setup then??application directly.
3. if lisence isn’t ?setup then lisence will install ?before the application automatically.

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i use search for?Registry key and value ,?launch condition to check? if? the machine is install the Lisence .the result is right.

but i question is that :?

? ? if? installer package is checked that? lisence isn’t ?setup then install the ?lisence , but after complete the installion of lisence? installer can't return to install the application???

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the question of installer(help me !!)