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You can use any older version.

Here are two sample projects (C# and VB.NET)  which works for me.

 

Launch rule

 

AddReference "C:\Path\To\bin\Debug\FormSampleCSharp.dll"
AddReference "C:\Path\To\bin\Debug\FormSampleVbNet.dll"

Dim form1CSharp As New FormSampleCSharp.Form1()
form1CSharp.PartNumber = iProperties.Value("Project", "Part Number")
Dim dialogResult1 = form1CSharp.ShowDialog()
iProperties.Value("Project", "Part Number") = form1CSharp.PartNumber

Dim form1VbNet As New FormSampleVbNet.Form1()
form1VbNet.PartNumber = iProperties.Value("Project", "Part Number")
Dim dialogResult2 = form1VbNet.ShowDialog()
iProperties.Value("Project", "Part Number") = form1VbNet.PartNumber