Official comment
Keep as many as you'd like! Just rename the app and away you go.

Hi Guys,
I have been using Pioneer controllers and rekordbox for just on 3 years. I currently run version 4.25 which is the most stable version I have found.
When I add more then 7000 songs I have glitches but other then that it is good.
My job is Djing so I rely heavily on stable software.
The problem I have is wanting to upgrade my software on Macbook which currently runs High sierra.
I am worried to upgrade to Mojave and then find rekordbox software is unstable.
I would also like to upgrade my 2014 Macbook pro to a touchbar version
Any ideas?
Advice?
Peoples experiences?
Thanks in advance,
Dan
Keep as many as you'd like! Just rename the app and away you go.

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HI Daniel,i'm on a 2015 MbP with 10.13.6 High Sierra and RB 5.4.3 is very stable,(plays 4\5hours gig with no problem with DDJ1000),try first to make a clean installation of High sierra and install latest RB version,i think that Rekordbox will run flawlessy.. but if you want to change the MbP with a Touchbar model and you'll buy a new one probably you 'll find Mojave on it..officially is supported by Rekordbox but only who have Mojave can said something to you..
I can rename the app and run multiple versions? That sounds great thankyou
And thanks Stefano that's really helpful along with the ability to try other versions of rekordbox. I will give 5.4.3 a go and see how it runs. Shame I couldn't find anything about Mojave users or even much about people running the touchbar versions of the macbook pro.