Setup Project CustomAction Set condition

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Hello Experts,

I have a C# application for which I have developed a SEtup & Deployment project to generate the installer. My application needs other application (OtherApp) to be installed prior installing my application. OtherApp is an exe file generated using NSIS installer. I added the OtherApp.exe to CustomActions under Install and the application gets installed.

Now I want to check the OtherApp already exists on the PC, if so then I don't want to install it. I can verify that using a Registry key. How do I implement this in my Custom Actions ? What's the best way to handle this scenario ?

NOTE : I tried implementing BootSrapper but the OtherApp is never executed.

Please help me am stuck at this stage and working to figure out since last 2-3 days. any help is highly appreciated.

Thanks in Advance.