Quote:
Originally Posted by Ma'am-I-Am
Would it be a good idea to install 6 while still keeping 4 as a sort of safeguard? Or does the installation process remove older versions first?
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Not directly possible. Only one Calibre (same bit count) can be installed.
You could use (move your current settings and Library) Portable (on an external drive)
But there is a different problem. I believe your version is so old, there was a DB structure update, so not backward compatible.