I only recently became aware of the lifecycle policy which eOne Solutions use for SmartConnect on-premise.
For SmartConnect 2018 and before the product is supported for three years on standard support and a further two years for extended support.
This means that SmartConnect 2018 is only under support until 15th December 2022; this means if you are using SmartConnect 2018 then you only have support on the product for another five months.
Versions of SmartConnect after 2018 use the “Modern Lifecycle Policy” which requires that customers stay current by always being on a supported release of SmartConnect which means applying at least one of the SmartConnect all-inclusive updates released within the last year from the current date. Basically, under the Modern Lifecycle you need to be applying one update per year for SmartConnect to remain on a supported version.
This ties in with the Microsoft Dynamics GP Modern Lifecycle which also requires an annual upgrade to be on a supported version.