If you need to upgrade your projects to v188.8.131.52, you have to install the corresponding platform setup in the v184.108.40.206. 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 v220.127.116.11 to 18.104.22.168.
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 v22.214.171.124 and v126.96.36.199 to upgrade the Syncfusion version. You can install v188.8.131.52 alone. If you don’t need v184.108.40.206, you can uninstall from Control Panel.Note:
As Syncfusion supports multiple versions you can have both v220.127.116.11 and v18.104.22.168 installed in your machine.Q3)
Should I install the .58 version , without check the "Remove previous versions" optionA3)
You can install the v22.214.171.124 by enabling the “Uninstall the previous installed assemblies from GAC” checkbox if you don’t want the v126.96.36.199 assemblies in GAC. Enabling this check box will remove the previously installed Syncfusion assemblies from GAC location.
If you are uninstalling the v188.8.131.52, then you have to migrate your projects to v184.108.40.206 by using any one of the above mentioned migration links depending on the platform project you are using.