Running per-machine installation conditionally on Custom NSIS script

[odiseo42]

• Version: 20.28.4
• Target: nsis-web

I plan to change my app from perMachine=true to perMachine=false, but on app updates, i want previous users that installed per machine to keep having their per machine installation.

I thought i could do this by adding "include": "build/installer.nsh" and do something like this:

!macro preInit
  # сheck registry for previous installation path
  ${if} ${FileExists} "C:\Program Files\${APP_FILENAME}" # is there a better way to detect a per-machine installation?
   # run the multi user installer
  ${else}
    # do nothing, as perMachine = false already
  ${endif}
!macroend

The reason for why i want to try this is because I want to keep oneClick: false. So really I have two questions as declared in my code above:

1. What is the best way to detect a per machine installation?
2. How can i make my include nsh script to run the per machine installation process?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[feelipegr]

If someone need, it can be done using this:

${if} $installMode == "all"