InstalleRex is classified by many vendors as adware for this reason. WebPick Internet Holdings Ltd., a company based in Ramat HaChayal Tel Aviv, Israel, created the program. The company is known to hook into a users web browser and collect information for other targeted advertisements. For these reasons, Malwarebytes recommends away from the Installerex installer as well as other PUPUPs (see the MalUP policy here). For more information, see the regshot capture below.”]
Source: https://blog.malwarebytes.com/threat-analysis/2013/12/installers-customizing-your-needs/