Words to Describe upgrades

How upgrades often is described ("________ upgrades")

• regular
• planned
• popular
• easier
• necessary
• simple
• substantial
• automatic
• most
• various
• incremental
• several
• annual
• cost
• potential
• seismic
• environmental
• class
• latest
• additional
• digital
• interior
• massive
• minor
• appropriate
• later
• continual
• rapid
• timely
• easy
• inexpensive
• costly
• based
• mechanical
• steep
• constant
• further
• free
• ongoing
• competitive
• expensive
• easiest
• periodic
• routine
• electrical
• frequent
• cosmetic
• functional
• technological
• recent
• available
• optional
• effective
• possible
• required
• unlimited
• profitable
• numerous
• structural
• successive
• future
• continuous
• unnecessary
• efficient
• significant
• subsequent
• major
• yearly
• extensive
• unspecified
• technical
• multiple
• level