Follow the below instructions to update Blamo Repo and Blamo Addons(Placenta & Neptune Rising) on your Kodi, you can also find video tutorial at the end of textual instructions:
01. From the main screen of Kodi click on Settings Icon that you can find at the top left corner of the screen
02. Click on File Manager
03. Select Blamo Repo, Right click on it and then click on Edit Source (If you can’t find Blamo Repo then simply click on Add Source option under File Manager)
04. Now you need to add new source which is: http://repo.mrblamo.xyz/ and click on Done
05. After that click on Text Box underneath “Enter a name for this media Source”, type Blamo repo and click on OK
06. After that you need to return back to the main screen of Kodi by pressing the return button(Back arrow)
07. Click on Addons
08. Now click on Addon Browser Icon that you can see on the top left corner of your screen
09. Click on Install From Zip File
10. Click on Blamo repo
11. Click on repository.blamo.x.x.x.zip and wait for Addon Updated notification
12. Now click on Install from repository
13. Click on Blamo Repo
14. Click on Video Addons
15. Click on Placenta and then click on Update to update the addon
16. Now go one step back and click on Neptune Rising and the click on Update to update the addon
Both Placenta and Neptune Rising addons are now updated and ready to use.
Here is the video tutorial that shows how to update both Blamo Repo and Placenta and Neptune Rising Addons on your Kodi: