I am working on two Winforms applications and I am using Visual Studio 2013 for both . One application requires sysncfusion version 10.2.0.56 and another requires 126.96.36.199. Earlier both apps were using older version 10.2.0.56. Till then everything was working fine but now one application has been upgraded to syncfusion version 12.1. Now after i installed this latest version of syncfusion on my machine , one application that requires the new version is working fine but another one which requires the older version 10.2.0.56 started throwing error since it is by default picking the latest version. I manually tried to remove that new assembly reference and added older one, but as soon as it gets added to visual studio solution and I check its version it shows the new one 12.1. I also tried keeping syncfusion assembly 10.2 in local bin folder and added from it, but it always picks the new one 12.1. I saw that the new one is in GAC while the older one is not . I don't want to add old syncfusion also to the GAC. Can any one help how can I add old syncfusion version to the project. Thanks in advance.