fyi, I used a virtual machine to install Plus as logged in as administrator, then switched users to non admin, no sandboxie.
I then restored the clean VM, downloaded the Classic 64mit version, installed it while logged in as non-admin, and wouldn't you know it, new desktop icon appeared as it should, SB was started and in the system tray, and right click context menu item for Run Sandboxed was there. The Plus version had no desktop icon and no context menu item.

I then rebooted and logged back in as non-admin and desktop icon is still there, SB is running in system tray and right click menu item is there.

So it would seem the current Plus 64bit version 1.0.8 doesn't install correctly on Win8, makes me wonder if it will install correctly on W10 to tell you the truth. The 64bit Classic version 5.55.8 seems to install on the same VM just as it should.

fyi,
Mark

1. Windows 8 or 8.1 ?
2. Could you test 1.0.10 too ?

I just updated my initial comment, it was an IE11 Win 8.1 OS in a virtualbox VM.
I also just downloaded 1.0.10 and installed to the vm and got the same results, on install only the sandbox is running in the system tray, no desktop icon and no right click context menu. When I reboot there is no SB in the system tray, still no desktop icon and still no right click context menu to run files as SB. I checked services.msc and the Sandbox Service is running and set to Automatic.
So 1.0.10 gives the same non working results as 5.55.8

FYI, I also just tested this on a Win10 VM in virtualBox downloaded from https://www.sysprobs.com/download-pre-installed-virtualbox-images-linux-windows, imported the appliance, the IEUser password is found here https://developer.microsoft.com/en-us/microsoft-edge/tools/vms/

I created a new user that was only in the users group, SandBoxIEPlus also fails to install correctly for this type of user, It seems the only way to have a successful install where icons appear on the desktop and the service successfully restarts and shows up in the system icon tray is to be a user in the administrators group. This isn't listed as a requirement that I could find anywhere in the SB documentation so it seems like it would sure limit the use of the product for anyone going through the download and installation process. And again I found that the Classic version will install and run successfully for a user that is only in the users group. SO it seems this new installer for Plus is broken.

In case you need to compare both installers more closely, see:
Sandboxie-Plus.iss
SandboxieVS.nsi

Thanks Isaak654, I don't really plan to do more testing now that I've proven the current Plus installer is broken in Win10 and Win8.1. Will wait for the next release with a fix whenever it comes out.

I'm not usual to comment things of which I'm not entirely aware, so I'm going to mention @mpheath for a possible reply.

The installer currently uses Current User for desktop icons and task based registry entries. The installer is doing what it is instructed to do. You could install it a million or more times and it will do the same thing.

I have submitted a Pull Request #1632 to change the desktop icons and task based registry entries to All Users. If commited and released, then you can expect different results with the install. Recommend uninstall of previous version before installing the new released version with these changes so that it gets the best results possible.

@isaak654 , thanks for the mention.

I would assume the "Classic" version, since it installs fine w/ a non-admin user is using "All Users"?
I understand the installer is doing what its instructed, but as with all code changes it seems "Plus" didn't follow what was working in the Classic version and no one bothered to test it until I did. Don't take my report as being snarky, my background is software QA testing. :-) Thanks for the code commit, I'll be happy to give it a go once tested and released.

@macattack12 I had the same issue, the temporary solution was to restart explorer and then I got the icon in tray

Issue marked as stalled work because of: #1632 (comment)