PUP.Optional.BundleInstaller is Malwarebytes’ generic detection name for bundle installers, aka bundlers.
Bundlers are typically installed by the users themselves, who are often unaware of the extra software that will be offered or even installed without giving the user a choice. Users typically agree to install the bundler because they want the main program the bundler has to offer.
Malwarebytes protects users from PUP.Optional.BundleInstaller by using real-time protection.
Malwarebytes can detect and remove PUP.Optional.BundleInstaller without further user interaction. If one of these bundlers has been detected on a system it is advisable to run a full system scan.
Should users wish to keep this program and exclude it from being detected in future scans, they can add the program to the exclusions list. Here’s how to do it.
If you want to allow the program to connect to the Internet, for example to fetch updates, also add an exclusion of the type Allow an application to connect to the internet and use the Browse button to select the file you wish to grant access.