Hello Sinnister, downloading both items and markings is relatively similar, so I will explain items installation with screenshots and then just highlight the differences with markings. I will also be starting from the beginning in case anyone in the future is looking for help. It is important to mention that these instructions may be slightly different than other explanations on the forum; this is because the downloads I am using to explain are a bit easier and only need to be placed directly into C:/Feralheart. Technically item meshes are placed into C:/Feralheart/media/items and markings go in C:/Feralheart/media/textures/markings. This can be ignored at the moment.
Items:
https://feral-heart.com/smf/index.php?topic=66501.0 <-- Link provided in thread. After clicking the link, you may be transported to a third-party site called Adf.ly. Just wait for the counter in the upper right-hand corner to reach zero and click "skip ad." After you will be transported to Mediafire. From there you can click the download button for the item pack.
After the item pack downloads, open the .zip file as follows. Move the folder named "media" and the items.cfg file directly into the Feralheart folder and click replace when prompted. That will overwrite your current files with the new ones.
Markings:
https://feral-heart.com/smf/index.php?topic=66500.0 <-- Link provided in thread. Again, there is a chance you may be moved to Adf.ly and all that jazz. Just follow the above instuctions for items and place everything into the main FH folder. Replace when prompted and you should be good to go.