Curious to find out whether there will be avast! 4.9 out, before 5.0 is released.
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It doesn't have to be the case, Alwil are working on avast 5 a major update.
If in the meantime a problem was found then an update would be made to avast 4.8 but I highly doubt it would go to 4.9 as that in itself is a big jump. It would be more likely that it would be an increase in the build number the bit after the 4.5, so it might go from say 4.8.1335 to 4.8.1350.
@ Black3agl3
avast isn't skipping a build, this is a major update and unlike firefox avast has been on avast 4.x for a few years and there have been many .1 increments which many other companies would have called a whole cardinal increment, e.g. 4.1 would have been 5.
I can remember using firefox 1.5beta when I was using avast 4, so there really is no comparison on how avast and mozilla do version numbering. Many companies change the version every year, add a few bells and whistles and charge the earth for the update.