AFAIK if you install QGIS with the standalone installer that just puts the application and everything it needs into a folder in program files. You may encounter issues if you installed multiple versions with the osgeo4w installer if you aren’t careful.
From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Patrick Dunford Sent: 08 June 2018 11:01 To: qgis-user ML Subject: Re: [Qgis-user] Unable to load project That may be the case for the application. However, depending on the installation, shared libraries may be overwritten when a new installation is carried out and cause older software versions to stop working. On 08/06/18 20:11, Philip Barlow wrote: I am happily running 2.18.20, 3.0.3 and 3.1 (nightly builds) side by side on Windows 10. 2.x and 3.x store their user settings and plugins in different locations so there are no conflicts. Phil From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Patrick Dunford Sent: 08 June 2018 05:02 To: qgis-user ML Subject: Re: [Qgis-user] Unable to load project The Windows version of Qgis allows you to run multiple versions on your computer side by side. I personally haven't used the Windows version for several years so I can't be sure if you will have any issues running 3.0 alongside your current version. I run many of the editions I have in virtual machines. If your PC has 8 GB or more of memory, or if you have access to another computer that can run Linux, then you can try it out in a Linux virtual machine or physical computer environment without disturbing your current installation. On 08/06/18 07:38, Springfield Harrison wrote: hello Patrick, thanks for your ideas. I will try the no plugins option. The program will run with no project loaded and it will run older project files but has problems with newer ones for the same project. I can load an older project file and then add newer layers to it and reconfigure them, Etc. This is very tedious but will amount to a recovery. It is better than starting from scratch for sure. But will the same problem reoccur? I have contemplated migrating to version 3 but I'm always leery of upgrades of anything as they often bring problems with them. In this list I notice many references to installation issues and things not running. 2.10 is a devil I know. can I expect any difficulties installing 3.0 +? Cheers . . . . . Spring Samsung Tab 4 On Jun 7, 2018 1:30 AM, "Patrick Dunford" <enzedrailm...@gmail.com<mailto:enzedrailm...@gmail.com>> wrote: Thre are a number of troubleshooting steps to try out 1. Start up qgis using the -noplugins switch or remove all installed plugins or test removing one at a time. 2. Backup the config file and start with a new empty config. Qgis 2.10 is well out of support, is there any reason you can't migrate to 3.0? On 07/06/18 18:28, Springfield Harrison wrote: hello Phil, I did open the project file in Word, 2033 pages, and found 13 instances referring to the dxf file. Hard to say if anything was wrong there, nothing obvious. At least to me. Some other research I did indicates that maybe there is an authentication problem, not sure just what that boils down to. I don't think the dxf file is the problem. I renamed it and bypassed it on the startup routine which the program accepted but it still seized up with a spinning cursor. Some things still function, such as modifying the properties of a layer , Etc. But the screen is blank and nothing can be saved. For some time I have noticed that loading a project file bogs down for a while and then would resume to completion. Now it bogs down and blows up. The key message seems to be unknown exception. Some older project files do load successfully however... Cheers . . . . . Spring Samsung Tab 4 On Jun 6, 2018 11:15 PM, "Phil Wyatt" <p...@wyatt-family.com<mailto:p...@wyatt-family.com>> wrote: Can you open a copy of the previous project file in something like notepad and see if anything obvious can be fixed and or removed in relation to the DXF layer? From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org<mailto:qgis-user-boun...@lists.osgeo.org>] On Behalf Of Springfield Harrison Sent: Thursday, 7 June 2018 1:36 PM To: qgis-user@lists.osgeo.org<mailto:qgis-user@lists.osgeo.org> List Subject: [Qgis-user] Unable to load project Hello All, Bad News. I am unable to load a project that normally works with no problems: 1. QGIS 2.10.1, Windows 7. 2. Project starts to load, loads many layers . . . 3. halts loading "point Entity", a DXF file 4. the DXF file was renamed to trigger the Handle Bad Layers service 5. this was bypassed but project loading still fails to complete, cursor spinner on constantly 6. exiting with Save triggers "Unknown Exception" 7. the project file is trashed to 0kb 8. Exiting without Save is OK but no project can be loaded 9. Restoring previous project file versions yields the same results 10. Loading some other projects works but may have cursor spinner Any ideas what is going on here? I have rebooted the computer. Thanks very much . . . . Cheers . . . . . 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