How can I back to the old version?

[Manami]

For a while(maybe  a year), I did not use PhotoStage which I purchased the licence. Then, when I opened PhotoStage, the system started to download the new version. Now version 5.23 is in my PC. 

The previously purchased licence is not supported by this v.5.23, so I need to re-install the old version. How can I get the old version?  Should I delete the current v.5.2 before installation of the old version? or the System recognise and automatically install the old version (say, overwrite)?

In addition, I was also using VideoPad. The same situation is occurred with this, so probably I should get the old version of VideoPad as well? 

Thank you for your support in advance.