When I installed MC11 for the first time I did the next:
- I kept my MC10 installations as they were.
- I installed MC11 with a custom option and installed it to a custom folder, e.g. ...path...\MC11.
- When MC11 asked to uninstall MC10 I denied.
- When MC11 asked to scan my HDs for media I denied.
- I went to Library Manager and set up a new empty library to a separate folder, e.g. ...path...\MC11Lib. At this stage I also made this new library default and deleted the first (empty) library that MC11 installer made.
- I imported an MC10 library backup to that new empty library in MC11.
- After that I had two separate programs with similar, but not the same libraries.
- It might be safer to disable tag information writing to files in MC11 options, because MC10 library doesn't reflect the changes made in MC11.
- At that time (August) it was possible to connect MC10 Media Server with MC11 and use it, but I don't know if that has changed. (Libraries are technically different and MC10 cannot connect MC11 Server.)
However, this gives a possibility to evaluate MC11 without changing the MC10 installation(s). It is better to use only one of the programs at a time. You can also install MC11 to all PCs and try the new Library Server. The 30-day try out period works if you have not installed MC11 earlier.