help wanted: how do i install this?

[dudeimeffinbaked]

Linux Mint 21.3 XCFE. im a Linux begginer. :-)

[echo2go]

You have multiples possibilities to install a icon pack.

for all user on your system you can put it under ...

# pwd
/usr/share/icons/NineIcons
# ll 
insgesamt 836
drwxr-xr-x 11 root root   4096 14. Mär 15:31 ./ 
drwxr-xr-x 10 root root   4096  5. Feb 13:51 ../
drwxr-xr-x  2 root root   4096 26. Jul 2022  Iconfactory/
drwxr-xr-x  4 root root   4096 13. Jul 2023  actions/
drwxr-xr-x  6 root root   4096 14. Jul 2023  apps/
drwxr-xr-x  4 root root   4096 18. Jun 2022  categories/
drwxrwxr-x  2 root root   4096 14. Jul 2023  cursors/
drwxr-xr-x  6 root root   4096 29. Dez 12:44 devices/
drwxr-xr-x  4 root root   4096 18. Jun 2022  mimes/
drwxr-xr-x  6 root root   4096 29. Dez 12:44 places/
drwxr-xr-x  6 root root   4096 29. Dez 12:44 status/
-rw-r--r--  1 root root 706882 29. Dez 12:44 alternate_icons.7z
-rw-r--r--  1 root root  89764 14. Mär 15:31 icon-theme.cache
-rw-r--r--  1 root root   1613 29. Dez 12:45 index.theme
-rw-r--r--  1 root root   6255 26. Jul 2022  index.theme.original
#

1b) Another possibility could be the path "/usr/local/share/icons". I'm not sure if all distros will use this path.

2. If you wanted only for your user account, you can extract it under "/home/USER/.icons" or for newer distros "/home/USER/.local/share/icons".

Please note that you have to edit the index.theme file. There are many bugs in it. After that you have to update your cache with "gtk-update-icon-cache /usr/share/icons/NineIcons"

The Window Border with the name PlatiPlus and ClassicPlatinumStreamlined have to be in ...

# pwd
/usr/share/themes
# ll ClassicPlatinumStreamlined/ PlatiPlus*
ClassicPlatinumStreamlined/:
insgesamt 36
drwxr-xr-x  5 root root  4096 18. Jun 2022  ./
drwxr-xr-x 20 root root  4096 19. Jun 2022  ../
drwxr-xr-x 20 root root  4096 26. Jul 2022  gtk-2.0/
drwxr-xr-x  2 root root  4096 18. Jun 2022  gtk-3.0/
drwxr-xr-x  2 root root  4096 26. Jul 2022  metacity-1/
-rw-------  1 root root 12288 18. Jun 2022  .swp
-rw-r--r--  1 root root   272 18. Jun 2022  index.theme

PlatiPlus:
insgesamt 12
drwxr-xr-x  3 root root 4096 18. Jun 2022  ./
drwxr-xr-x 20 root root 4096 19. Jun 2022  ../
drwxr-xr-x  2 root root 4096 26. Jul 2022  xfwm4/

PlatiPlus26:
insgesamt 12
drwxr-xr-x  3 root root 4096 18. Jun 2022  ./
drwxr-xr-x 20 root root 4096 19. Jun 2022  ../
drwxr-xr-x  2 root root 4096 26. Jul 2022  xfwm4/

for all users. Or if you prefer only for you, you have to put it in the equivalent "~/share/themes"

and the last folder ...

# pwd 
/usr/share/backgrounds/OS9-wallpaper
# ll
insgesamt 28
drwxr-xr-x 7 root root 4096 18. Jun 2022   ./
drwxr-xr-x 4 root root 4096  5. Feb 13:51  ../
drwxr-xr-x 2 root root 4096 26. Jul 2022  '3D Graphics'/
drwxr-xr-x 2 root root 4096 26. Jul 2022   Convergency/
drwxr-xr-x 2 root root 4096 26. Jul 2022  'Ensemble Pictures'/
drwxr-xr-x 2 root root 4096 26. Jul 2022   Finder/
drwxr-xr-x 2 root root 4096 26. Jul 2022   Photos/

and for the two fonts you can put it in

# pwd
/usr/share/fonts/macos9
# ll
insgesamt 160
drwxr-xr-x  2 root root  4096 26. Jul 2022  ./
drwxr-xr-x 19 root root  4096 29. Aug 2023  ../
-rw-r--r--  1 root root 82634 26. Jul 2022  Charcoal.ttf
-rw-r--r--  1 root root 65704 26. Jul 2022  MONACO.TTF

or "~/. fonts" for your user.