Hello.
When a new version of MCS is released, the vip codes are updated. This means that a code from v0.2.5 will not work on v0.2.6.
However, this doesn't mean that you have to "buy" the new code, but you do need to have an active subscription on Patreon to get acceso to the posts that contain the codes.
For example, if you are an active Patron at the beginning of the month, let's say it's June 6, and the latest release is 2.5, when 2.6 is relesed, let's say on June 10, you will get acceso to both 2.5 and 2.6 codes.