If you need to upgrade your projects to v184.108.40.206, you have to install the corresponding platform setup in the v220.127.116.11. Q1)
when I did the update, I tried to use migration tool, but I did not get any resultsA1)
Please let us the know which project you are migrating from v18.104.22.168 to 22.214.171.124.
If you are using Windows Forms, WPF, Silverlight or ASP.NET project, please follow the steps suggested in the following documentation link to migrate your projects.http://help.syncfusion.com/common/essential-studio/utilities#project-migration
if you are using ASP.NET MVC (Web) Or Syncfusion ASP.NET MVC (Classic) project, please follow the steps suggested in the following documentation link to migrate your projects.http://help.syncfusion.com/extension/aspnet-mvc-extension/project-migration
Also let us know if you face any issues while migrating the projects using above steps. Q2)
Should I install both versions.A2)
It is not required to install both v126.96.36.199 and v188.8.131.52 to upgrade the Syncfusion version. You can install v184.108.40.206 alone. If you don’t need v220.127.116.11, you can uninstall from Control Panel.Note:
As Syncfusion supports multiple versions you can have both v18.104.22.168 and v22.214.171.124 installed in your machine.Q3)
Should I install the .58 version , without check the "Remove previous versions" optionA3)
You can install the v126.96.36.199 by enabling the “Uninstall the previous installed assemblies from GAC” checkbox if you don’t want the v188.8.131.52 assemblies in GAC. Enabling this check box will remove the previously installed Syncfusion assemblies from GAC location.
If you are uninstalling the v184.108.40.206, then you have to migrate your projects to v220.127.116.11 by using any one of the above mentioned migration links depending on the platform project you are using.