Is it not for OpenOffice?
OP's question is about OnlyOffice
If not, please open the Software store from the app menu: software
Click the Installed button at the top.
It is in alphabetical order - scroll down and search for Open Office.
Click on the entry and scroll down the page to check Source.
From what I understand, Open Office needs java runtime environment...
EDIT Only office. Not open office. See how long I have been on the forum troubleshooting? I am getting brainless and illiterate.
This is what happens...
I never even heard of onlyoffice...
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I understand it.
But OP is NOT asking about OpenOffice.
He is asking about OnlyOffice.
Those are two different apps.
I bet it is a Snap. 
I used it a short while when I was using Peppermint OS.
Peppermint has a very slick desktop integration for such web apps.
Not necessary so.
When you search for OnlyOffice in Software, the first one showing is Flatpak.
(That was the starting point of our Flatpak ordeal BTW.)
I downloaded a DEB file for Only Office and tried to install it. That is probably how it ended up in the apps list.
Thanks for this additional info.
This would certainly help our detective work.
While you trying to install this deb file, did you get any error message?
Also, please let us know the version of your Zorin.
Zorin 15.3 or 16 beta / Core/Lite/Ultimate
No, nothing seems to happen.
I think I have Zorin 15,3 Core.
Did you download the .deb file?
Is it still in your ~/Downloads folder?
If so, you can double click it to open it in the Gdebi Installer. It will have two buttons on the upper right side- Reinstall or Remove.
I think OP has to install Gdebi first.
I do not remember it comes with Zorin.
sudo apt install gdebi
If OP lost the installer it is here:
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Ok, corrected version:
Did you download the .deb file?
Is it still in your ~/Downloads folder?
If so, you can double click it to open it in the Installer. It will have two buttons on the upper right side- Reinstall or Remove.
I do have Libre and am running it. I just want to have a second similar app.
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I do have the file in a folder. I go thru the installation process but still can't get it to run. I may just have to bail on this app.
A few suggestions
Abiword for Word-processing.
Gnumerics for spreadsheet.
Both can be found in Software.
Gnumerics is app installer only.
But watch out for Abiword. Make sure to install app version, not Flatpak version.
Alternatively, you could open the terminal (ctrl + alt + T)
and issue the following commands:
sudo apt update && sudo apt upgrade
sudo apt install abiword gnumerics
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@FrenchPress et al, From experience, which spreadsheet app gives best (comparable quality) visual results for graphs/graphics compared to Excel?
My husband is using LibreOffice.
But I tend to go to the VM Windows Office for anything bit more complicated.
I just checked and found this interesting comparison site.
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Okay, I downloaded abiword and gnumeric and got them to work. Thanks for everyone's help.
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