Addon missing assets during install

[VeraSimon]

During install of the addon (2017-01-24 upload date), Freeplane 1.9.7 threw an error like the one mentioned in #1. Freeplane notified of multiple errors, so upon looking through the log, I also noticed a number of assets missing that the addon was trying to load as well, as shown in the snippet below. I see that the install directions mention a zip file, but only the .mm file is available from this repository, and no releases are available in the releases section either. Is there somewhere to get these missing assets? Is this a bug with newer Freeplane versions? Or was this just an oversight?

STDOUT: Sep 02, 2021 12:20:29 PM org.freeplane.core.util.LogUtils info
INFO: installing add-on from C:\Users\me\Desktop\importOPMLtoselectednode.addon.mm
STDOUT: Sep 02, 2021 12:20:33 PM org.freeplane.core.util.LogUtils warn
WARNING: add-on has no property link (hopefully that's not bad)
STDOUT: Sep 02, 2021 12:20:33 PM org.freeplane.core.util.LogUtils severe
SEVERE: can not load icon '/images/ImportOPMLtoselectednode.svg'
STDOUT: Sep 02, 2021 12:20:33 PM org.freeplane.core.util.LogUtils severe
SEVERE: can not load icon '/images/ImportOPMLtoselectednode.png'
STDERR: missing key Import OPML to selected node
STDOUT: Sep 02, 2021 12:23:01 PM org.freeplane.core.util.LogUtils severe
SEVERE: can not load icon '/images/ImportOPMLtoselectednode.svg'
STDOUT: Sep 02, 2021 12:23:01 PM org.freeplane.core.util.LogUtils severe
SEVERE: can not load icon '/images/ImportOPMLtoselectednode.png'
STDERR: missing key Import OPML to selected node
STDOUT: Sep 02, 2021 12:23:01 PM org.freeplane.core.util.LogUtils severe
SEVERE: can not load icon '/images/ImportOPMLtoselectednode-icon.svg'
STDOUT: Sep 02, 2021 12:23:01 PM org.freeplane.core.util.LogUtils severe
SEVERE: can not load icon '/images/ImportOPMLtoselectednode-icon.png'
STDOUT: Sep 02, 2021 12:24:09 PM org.freeplane.core.util.LogUtils info