I installed JCL/JVCL in my Delphi 10 Seattle, first from getit, later manually. I cannot install the jvPluginSystem design package. All packages work well but this design package produces an EAccessVialolation in jclDeveloperTools. I double checked for multiple instances of dcu's and bpl's and also tried on a freshly baught Windows 10 Surface pro without any other Delphi versions. Same result. I also checked that unitversioning is off in JCL and JVCL and did a complete build of the packages.
I suspect that it came either with the latest Delphi Update 1 for Seattle or it is a Windows 10 related issue. Did anyone also experience this Problem?
I used Version 3.4.9 Complete Package (including JCL) from Sourceforge.