Glossary

I will be throwing these terms around in all my posts, you better get familiar with them if you want to understand what I am saying(writing?)

RCP X.Y- Replay Compatibility Pack - it is everything, numbers after it specify for which WoT version it is designed.
Example: RCP 8.7 is to be installed on WoT 8.7.

RCV W.Z@X.Y- Replay Compatibility Version - a small (currently, in past it was big) package made to supported specified version of WoT replays. Numbers indicate support game version and required RCP version.
Example: RCV 8.6@8.7 means that this package allows you to watch 8.6 replays on WoT 8.7.

RCC A.B-C.D - Replay Compatibility Change - a big (it was part of RCV in the past) set of packages containing files from version A.B that got changed on C.D and are required to watch old replays properly.
Example: RCC 8.6-8.7 is required by RCV 8.6@8.7 to achieve compatibility of replays.

RCS - The thing you download, its RCV combined with RCC's of same version, and launcher batch file.