18.4 has problems with commercial skipping, if you use that feature for recorded programs. A fix has been made for Matrix (Kodi 19), And should be backported for release with 18.5. Until then, 18.3 works with commercial skipping, and is still available from Kodi's servers for all platforms they host.
The developers have not made available an up-to-date addon page or repository for this. Presently the only option is to scan the thread from the bottom up looking for the most recent release for your platform mentioned. Unfortunately, because of the nature of Kodi PVR addons, this does not include Linux builds at this time.