Trying get a new license yet another machine, however when I install the SQL Express 2014, it found that the system already has a higher version of the .Net Framework. The .Net 3.5 Service Pack 1 is no longer available from Microsoft, so where to find a copy and how to downgrade .Net Framework.
Also, I think my other system have .NET Framework of higher version and I still can run the SQL Express and Samba POS v5.
Can you send a screenshot of where it says that you it has a higher version already installed? Usually if it has a higher version its never caused a problem to install it.
If your installing fresh sql go ahead and get latest version which is 2016.
Agreed but this machine seems not too standard. I will get screen shot when I get back to that machine.
SambaPOS requires .NET 4.5
Probably SQL 2014 requires that too.
Either way, there is no point in even trying to “downgrade” .NET to an earlier version.
update:
Just try to reinstall several things .Net and SQL all seems to get stuck at the .NET compatibility. It may be a bad copy of the old version(4.0) installed and or some registry is messed up preventing the upgrade and/or the compatibility check of SQL installation.
Now, the task becomes finding how to delete the .Net completely and reinstall a fresh copy.
Good day Kendash. What if after generate the sqlce file, it comes out 4 files. which one should we choose? why it come out separate 4?
file name :
mysambaposdata_0000.sqlce
mysambaposdata_0001.sqlce
mysambaposdata_0002.sqlce
mysambaposdata_0003.sqlce
You use them all. It has size limits. Run each one in sequence.
thanks for fast reply 
The original location referred to above for the Toolbox looks to have changed. It eventually points to here: https://ci.appveyor.com/api/projects/ErikEJ/sqlcetoolbox/artifacts/SqlCe40ToolBox.zip?branch=master
Yes you can use latest version.