My files on the IPS Marketplace will usually work fine for every third level release of the second level release they were made for. So a release for IPS 4.2.0 should work for 4.2.1, 4.2.2, 4.2.3 and so on or I will provide an update free of charge.
After a new second level release of the IPS Community suite I will revisit the file. It may or may not need changes and I may or may not discontinue the file. Usually I will offer an update free of charge, but I reserve the right to not provide a version for the new second level release, e.g. because the functionality is not needed anymore or the number of sales doesn’t justify the work for the update.
Also keep in mind that support is only provided for the latest release of the IPS Community Suite. If the current release is 4.3.6 and you are still at 4.3.1 because you don’t have an active IPS license, I might not be able to help you. The problems you have might be resolved after an upgrade and I might not be able to test problems on older releases, so I need to ask you to upgrade to the latest release first.