Is it possible to install Two Versions of LibreOffice on Same Computer?
However, I want to also install LO 5.1 on the same computer because customers send me Microsoft Publisher files, and I see that LO 5.1 can open them with ease, whereas 3.4.3 does not.
I have read that other users have multiple installs of LO on the same computer, but I get an error (see attached) This error seems to think that LO 3.4.3 is open, but nothing in the task manager, I have rebooted, not opened anything. I have even gone so far as to remove the “Quickstarter” from the installation of 3.4.3 and also deselect this option from 5.1.
I do see that my LO 3.4.3 is in its aptly named folder in Programs(x86) and the LO 5.1 is in its corresponding name, so this is not an issue of installing in the same folder.
So I am stumped. Can anyone shed any advice on how to achieve this?
He is developing a java version, for all OS.
https://flosmind.wordpress.com/2015/08/24/java-si-gui-snapshot-4/
LibreOffice.app/program/bootstraprc that can be edited to change the user profile path? As per the wiki page instructions under GNU/Linux I routinely edit /5 to (for example) /5122 to more clearly illustrate version and allow parallel execution without issue. 
An installer packaged in the PortableAppsFormat unpacked to its specific location, say RelativeRoot, will establish there also its specific user profile as RelativeRoot\Data\settings\user .
In addition you can edit RelativeRoot\App\AppInfo\Launcher\LibreOfficePortable.ini appending
SingleAppInstance=false
to the (first) section [Launch] to allow for the creation of a LibO (soffice.exe) instance in parallel to an already running one.
Also refer the remarks concerning different (from Win) OS in comment #1 (Lupp) and in comment #3 (oweng).
The PortableApps site is naming as system requirements:
Refering the WinHQ site concerning Mac OS X this should apply to V10.8 and higher.
(For Win users:)
I personally have a true lot of versions at hand. This for “historical interests” and for backing my contributions rto the forums. However, I never install “in parallel” (except for now and then a developer version), but use the vesrsions distributed in the PortableApps format (.paf.exe). These packages are self-extracting archives and do not need an installation. Simply expand to an empty folder. That’s all.
(For Linux users:)
A few years ago my experiments (using a Ubuntu flavour) showed .paf.exe packages also to correctly expand under Linux/Wine. LibreOffice worked with sufficient speed using Wine, too. I do not know the current situation to any detail.
(Concerning Portable versions:)
The .paf.exe packages are available via this PortableApps page or from this location maintained by the The Document Foundation itself. (Don’t worry about the “old”.) There is a slight delay for new versions to be packaged as portable apps. Presently the most recent portable version is 5.0.4.
Currently installed: LibO V5.1.2 on Windows 10
Maybe we might! (Create a powerful UFO: United Free Office!) Lupp from München