Hi,
Yes. ASPXToPDF Web control is only added very recently so you need the current build in order to use that Web control. The cost to upgrade from v7 to v8 is about $100.
Note you only need the new build if you wish to use the ASPXToPDF web control, which offers a more convenient way for you to convert your ASP.NET page to PDF. Because the actual conversion is done by EO.Pdf, so it is still possible for you to convert your page to PDF without the web control --- but it would require some additional code on your side if your page requires login or rely on session data. See this post for more detail:
http://www.essentialobjects.com/forum/postst5528_How-to-convert-a-Web-page-that-requires-login-to-PDF.aspxWith the server control, you can simply place the control in your page regardless whether your page requires login or not.
Thanks!