If you have problems with OES migtools, or otherwise want to try the
older tools, here is one trick to bypass the version checks - which
would normally end the process as current versions are too new for the
old tools;

When the SCMT wizard does the pre-checks, it creates
\\sys\scu\installedsmsversion.txt file.

Delete that file on the background, then the wizard just says that it
cannot check versions and allows you to continue with process.

and as usual, this is not a supported way and use it on your own risk,