Digitally sign the installers with YOUR certifictae

As a software vendor you need to digitally sign the installers for your product.  Every other remote support vendor does this.  You should not be making your clients pay for their own certificates to sign your installers, they will always have issues with reputation and being blocked by endpoint security.  It is simple common sense to make a trusted installer (exe and msi), sign it yourself with your own certificate.  Do not allow clients (i mean connectwise customers) the ability to edit this installer, but do provide install options by switches to specify server, clientname, groups etc to target it.  Then provide further options by policy from the server to assign branding, hide the icon, hide the banner, etc etc.