I note that offline explorer is updated regularly. I always go to your website and offload the latest version, then install it. Is there no quicker way for example a tab for "search for latest edition and update". And also, for how long is a purchased license valid? Would I need a new license for version 4.0 for example.
For new versions:
Go to Options, Advanced -> New Versions. Set it as you like!
Upgrade info from their website:
All minor upgrades (i.e., 1.1, 1.2, 1.x, etc.) are FREE to registered users.
In general, all major upgrades (i.e., 1.0, 2.0, x.0, etc.) require full re-registration. However, depending on the type of program, customers may not be charged for major upgrades. A major upgrade is defined as a significant modification of the program`s function or interface or both.