Classic Smartstore.NET 4 is Framework 4.7.2. Anything older than 4.2 has no supported jump. Current 6.4.0 is on .NET 10. We will tell you whether the documented climb is worth it, or whether to leave.
Australian .NET team. We look at the store before anyone talks about a rebuild.
01
What you have
02
What is safe to keep
03
Upgrade or move
The store still takes orders. That is why it has been left alone.
Smartstore is an open-source B2B and B2C shop from Smartstore AG. Classic Smartstore.NET and current Smartstore are not the same product surface. A lot of the installs we hear about were built on Framework MVC, then the person who knew the theme left.
You might recognise one of these:
You do not need a new brand, or a Shopify pitch. You need a clear read on the store you already have.
Smartstore is still a real product. Current GitHub line is Smartstore 6.4.0, published 29 May 2026, updated to .NET 10. The README calls it an ASP.NET Core 10 platform. The problem is not that the vendor vanished. It is that 5+ is a port of classic Smartstore.NET 4, not a DLL retarget.
Vendor and README: upgrading from versions earlier than 4.2 is not supported. Migrate to Smartstore.NET 4.2 first, then upgrade to Smartstore 5+. From 4.2 you replace application files, keep App_Data, and data migrates automatically. There is no vendor calendar EOL for 4.x on the pages we can cite. What we can say: 4.x is Framework-era; current investment is the Core / .NET 10 line.
Pre-4.2 has no documented jump. 5+ is a port. That is why stores stall.
Smartstore.NET 4 ran on .NET Framework 4.7.2 and ASP.NET MVC. Smartstore 5+ is the ASP.NET Core port of that product. Themes, plugins, and Framework MVC customisations do not become Core modules by file copy. Payment and shipping providers on 4.x may have no 6.x module. Plugins and themes are version-locked to the Core line.
The open-source line is AGPL-3.0. A commercial licence is something you buy from the vendor if you do not want that copyleft on customisations. We will not call AGPL “free for any commercial use”. That review is often why the project never starts.
Microsoft’s .NET 10 LTS ends 14 November 2028. That is a real runway after the port. The ecosystem is smaller than nopCommerce or a hosted SaaS. We will not invent Australian store counts. Hiring and plugin coverage are the constraint, stated as ecosystem size, not a census.
None of that makes the catalogue or the order rules worthless. It does mean “replace the files on Monday” is the wrong first move if you are older than 4.2, or if the theme is the store.
We start with the store, not with a destination.
Version (pre-4.2, 4.2, or already 5+), themes and plugins, payment and shipping providers, whether customisations are AGPL-sensitive, and how the site is hosted. We will tell you whether the documented 4.2 → 5+ path applies.
There are three honest outcomes. We recommend one, not all three.
Catalogue and orders matter more than a clean-room rebuild. Framework themes and plugins that have no Core module do not come across.
Source, a short record of what changed, and a store someone else can understand.
We will not tell you Smartstore 6 is a file copy of 4. We will not tell you Shopify is the answer to every Framework shop. If you already know you want to stay on Smartstore forever, the vendor’s own path may be a better fit. If you want an honest fork in the road, talk to us.
A URL and a rough version is enough to start.
The first call is 30 minutes. You leave with a recommendation you can take to a manager, not a rebuild estimate pulled from thin air.
We have taken over and modernised ageing .NET systems for Australian organisations, including work with Data#3, Hastie, NESS, and NSW Health. NESS is nopCommerce maintenance and a Dynamics NAV integration — related commerce work, not a Smartstore upgrade. We have not published a Smartstore case study. Your store still starts with its own assessment. We will not pretend it is a project we have already published.
Thirty minutes. Bring a URL and a version number if you know it. We will tell you whether to climb from 4.2, leave Smartstore, or leave it alone for now.
Book a free 30-minute discovery call