Add FxPlug version to previously purchased AE-compat version

Add RSMB regular FxPlug v5 to RSMB AE-compat regular or Pro, any version

$29.97, 5/$127.37, 10/$239.76, 15/$337.16, 20/$419.58, 25/$487.01, 30/$539.46, 35/$576.92, 40/$599.40
Add RSMB Pro FxPlug v5 to RSMB Pro AE-compat any version

$44.99, 5/$191.21, 10/$359.92, 15/$506.14, 20/$629.86, 25/$731.09, 30/$809.82, 35/$866.06, 40/$899.80