Hi, When I try to log onto to the Server Version of Manager , this is the message that I receive
It appears you are trying to open a file which has been already accessed by newer version of Manager. Upgrade to the latest version of Manager and try to open this file again.
is there an update server Version?
Thanks
See the Guide: Self-host a Manager installation | Manager
When I key in the Server Key a message comes up this License is for versions older than 23.1 or lower.
The current version is 23.2
Are you able to send us a link to the original software we paid for?
Thanks
Internal Error
Manager 21.9.8
System.NullReferenceException: Object reference not set to an instance of an object.
at Manager.Database.OfTypeT in C:\projects\manager\Manager\Database.cs:line 110
at ManagerServer.HttpHandlers.Template.Get() in C:\projects\manager\ManagerServer\HttpHandlers\Template.cs:line 135
at ManagerServer.HttpHandlers.HttpHandler.ProcessRequest() in C:\projects\manager\ManagerServer\HttpHandlers\HttpHandler.cs:line 96
at ManagerServer.Startup.<>c.<b__1_1>d.MoveNext() in C:\projects\manager\ManagerServer\Startup.cs:line 96
— End of stack trace from previous location —
at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware.g__Awaited|6_0(ExceptionHandlerMiddleware middleware, HttpContext context, Task task)
That is a very old version of Manager (September 2021, while now thousands of versions later it is version 23.7.21.901). I am sorry not being able to help as I use the Linux Server edition.
too bad, I paid $ 600 + GST for a perpetual license that should not have stopped working.
Probably the ombudsman will be of more assistance.
This means you or someone else opened the business file in a newer version (maybe in a desktop edition?) and older version’s business files will then be converted to the newer version and can’t be opened again in an older version.
Yes, see https://www.manager.io/server/ and read carefully! [emphasis added]
No Monthly Fees
Server license is a one-time purchase and entitle you to perpetual use. The first 12 months of maintenance - product updates and support - are included free.
So to get updates you have to renew the license yearly. As @Mark explained someone has been using a newer version of Manager (probably Desktop) and imported that file into the much older Server version you are using. You have to remove that new “business” and continue with the ones created in the Server edition that you are using.
I forgot to mention that the solution is to use a backup file.
Looks like you opened your .manager database file with a later version of manager, which has the effect of updating the schema version embedded in your file.
It is possible to rollback this embedded schema version, so that the file can be opened with your older manager software.
You’ll need to have sqlite installed. See How To Download & Install SQLite Tools
You’ll also need to find an old backup .manager file, from which you can extract the schema version of the Manager software that created the file. See Database versioning - #3 by d3mad
The rolback process makes a change to your database file, so please make a copy before you do it. There may also be changes that the newer version of Manager made, so if you succeed, have a good poke around your data before you celebrate.
For the process, see Almost Everyday there are new versions - #15 by Bob_Hunt (make sure that single quote marks are used; not backticks).
I guess from now on that you’ll be doing daily backups. 
The latest version that will work with your product key would be 23.1.31
Here is the link to it: https://github.com/Manager-io/Manager/releases/tag/23.1.31.606