@turner2f
Like @Licensecart says, the upgrade is only for people that alredy have "Support Manager Pro" installed, if you never installed "Support Manager Pro" and you only use the default from Blesta "Support Manager", you cannot install the "upgrade"
You have to uninstall the Upgrade, remove all files, then if you dont need the Default Blesta "Support Manager" and you plano to only use my modification Support Manager Pro, unistall also the "Support Manager" from your Blesta, afther that, download the Full Support Manager Pro from my first post:
Any problem just post it here
P.S- Many thanks @Blesta Addons and @Licensecart
Regards,
PV