If you are using a stable V4 release, and do not have a mission critical project in the works, then I suggest you grab a recent nightly of V5RC3. You will probably have a better transition experience if you read up a little bit on the forum about Environment Variables; this is not clearly going to be “fixed” at the release of V5 (as known at this time).
Many forum users have left the V4 stable for quite some time now, and have not had major issues. In fact, I personally have had far fewer issues with the nightlies than I have had with the “stable” V4 releases; disclaimer: there have been a small number of some specific nightlies where there were obvious problems that were fixed right quickly after.
If one has a solid version control system in place it remains my opinion that is best for most KiCad users (without a mission critical V4 project in the works) to migrate to V5 with the one of the current RC3 nightly builds.