Cannot install Subclipse plug-in in Eclipse - eclipse

Question

I cannot install Subclipse both from "install new software" and Eclipse Marketplace.
When I try to install Subclipse 4.2.3, I got this:
For the second option "Update my installation to be compatible with the items being installed":
For the third option "Show original error and build my own solution", I got following error:
Cannot complete the install because of a conflicting dependency.
Software being installed: Subclipse 4.2.3.201707071932 (org.tigris.subversion.subclipse.feature.group 4.2.3.201707071932)
Software currently installed: Subversion Client Adapter (Required) 1.10.3 (org.tigris.subversion.clientadapter.feature.feature.group 1.10.3)
Only one of the following can be installed at once:
Subversion Client Adapter 1.10.3 (org.tigris.subversion.clientadapter 1.10.3)
Subversion Client Adapter 1.9.4.2 (org.tigris.subversion.clientadapter 1.9.4.2)
Cannot satisfy dependency:
From: Subversion Client Adapter (Required) 1.10.3 (org.tigris.subversion.clientadapter.feature.feature.group 1.10.3)
To: org.tigris.subversion.clientadapter [1.10.3]
Cannot satisfy dependency:
From: Subclipse 4.2.3.201707071932 (org.tigris.subversion.subclipse.feature.group 4.2.3.201707071932)
To: org.tigris.subversion.clientadapter [1.9.4.2]
(I guess the reason is here! I may have installed Subversion Client Adapter some version already. But I cannot see it from Eclipse. If this is the problem, could you tell me where to uninstall it?)
After I selected the second option, I got this error:
An error occurred while collecting items to be installed
session context was:(profile=C__Users_eclipse_jee-neon_eclipse, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
No repository found containing: osgi.bundle,com.collabnet.subversion.merge,4.2.0.1
No repository found containing: osgi.bundle,com.trilead.ssh2,1.0.0.build220_r167_v20150618_1733
No repository found containing: osgi.bundle,org.tigris.subversion.clientadapter,1.9.4.2
No repository found containing: osgi.bundle,org.tigris.subversion.clientadapter.javahl,1.9.4.1
No repository found containing: osgi.bundle,org.tigris.subversion.clientadapter.svnkit,1.8.12.1
No repository found containing: org.eclipse.update.feature,org.tigris.subversion.clientadapter.svnkit.feature,1.8.12.1
No repository found containing: osgi.bundle,org.tigris.subversion.subclipse.core,4.2.3.201707071932
No repository found containing: org.eclipse.update.feature,org.tigris.subversion.subclipse,4.2.3.201707071932
No repository found containing: osgi.bundle,org.tigris.subversion.subclipse.ui,4.2.3.201707071932
No repository found containing: osgi.bundle,org.tmatesoft.sqljet,1.1.10.r1317_v20140121_0107
No repository found containing: osgi.bundle,org.tmatesoft.svnkit,1.8.12.r10533_v20160129_0158
When I try to install Subclipse 1.10.x from "http://subclipse.tigris.org/update_1.10.x", I got this error:
An error occurred while collecting items to be installed
session context was:(profile=C__Users_eclipse_jee-neon_eclipse, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
No repository found containing: osgi.bundle,org.tigris.subversion.clientadapter.javahl,1.8.15
No repository found containing: osgi.bundle,org.tigris.subversion.clientadapter.javahl.win64,1.8.15
No repository found containing: osgi.bundle,org.tigris.subversion.subclipse.mylyn,3.0.0
My environment:
Windows 10, 64 bits
Eclipse Neon.3 Release (4.6.3)
SVN 1.8.17(r1770682)
Java version "1.8.0_121", Java HotSpot(TM) 64-Bit Server VM (build
25.121-b13, mixed mode)

Answer 1

It seems you have installed an older version of Subclipse (see your second screenshot).
Try to uninstall the older version first: in Help > About Eclipse click Installation Details, in tab Installed Software select the Subclipse, Subversion, SVN Adapters, etc. and click Uninstall...

Answer 2

I had a similar problem after updating Eclipse SDP (RAD and RDi bundle), but I did not have Subclipse listed in my Installation Details (despite it being installed prior to the update). Re-installing Subclipse from eclipse Marketplace and then again using the "Install New Software" prompt resolved the issue.