For Houdini 18

From here you can install the add-on manually.

Drop VEX.sublime-package file into Data/Installed Packages

Example:
C:\Users\teared\AppData\Roaming\Sublime Text 3\Installed Packages\VEX.sublime-package

Then follow the rest of the readme, including optional setup sections.

Release 7.1.2

1. Updated for Houdini 18.

2. New VEX functions added:

   abspath
   agentchannelnames
   agentchannelvalue
   agentchannelvalues
   agentclipstarttime
   agentrigfindchannel
   agenttransformgroupmemberchannel
   chrampderiv
   chsop
   combinelocaltransform
   cregioncapturetransform
   cregiondeformtransform
   cregionoverridetransform
   decodeattrib
   decodeparm
   encodeattrib
   encodeparm
   extractlocaltransform
   ggx
   lightstate
   objectstate
   oppreparmtransform
   opprerawparmtransform
   oprawparmtransform
   pccone
   pccone_radius
   pcline
   pcline_radius
   pcsegment
   pcsegment_radius
   premul
   relpath
   removevertex
   setagentchannelvalue
   setagentchannelvalues
   setdetailintrinsic
   solvetriangleSSS

   usd_addattrib
   usd_addcollectionexclude
   usd_addcollectioninclude
   usd_addinversetotransformorder
   usd_addorient
   usd_addprim
   usd_addprimvar
   usd_addrelationshiptarget
   usd_addrotate
   usd_addscale
   usd_addtotransformorder
   usd_addtransform
   usd_addtranslate
   usd_attrib
   usd_attribelement
   usd_attriblen
   usd_attribnames
   usd_attribsize
   usd_attribtimesamples
   usd_attribtypename
   usd_blockattrib
   usd_blockprimvar
   usd_blockprimvarindices
   usd_blockrelationship
   usd_boundmaterialpath
   usd_clearmetadata
   usd_cleartransformorder
   usd_collectioncomputedpaths
   usd_collectioncontains
   usd_collectionexcludes
   usd_collectionexpansionrule
   usd_collectionincludes
   usd_drawmode
   usd_findtransformname
   usd_flattenedprimvar
   usd_flattenedprimvarelement
   usd_getbbox
   usd_getbbox_center
   usd_getbbox_max
   usd_getbbox_min
   usd_getbbox_size
   usd_getbounds
   usd_getpointinstancebounds
   usd_hasapi
   usd_haspayload
   usd_isactive
   usd_isarray
   usd_isarraymetadata
   usd_isarrayprimvar
   usd_isattrib
   usd_iscollection
   usd_iscollectionpath
   usd_isindexedprimvar
   usd_isinstance
   usd_iskind
   usd_ismetadata
   usd_isprim
   usd_isprimvar
   usd_isrelationship
   usd_isstage
   usd_istransformreset
   usd_istype
   usd_isvisible
   usd_kind
   usd_localtransform
   usd_makeattribpath
   usd_makecollectionpath
   usd_makepropertypath
   usd_makerelationshippath
   usd_metadata
   usd_metadataelement
   usd_metadatalen
   usd_metadatanames
   usd_name
   usd_parentpath
   usd_pointinstance_getbbox
   usd_pointinstance_getbbox_center
   usd_pointinstance_getbbox_max
   usd_pointinstance_getbbox_min
   usd_pointinstance_getbbox_size
   usd_pointinstance_relbbox
   usd_pointinstancetransform
   usd_primvar
   usd_primvarattribname
   usd_primvarelement
   usd_primvarelementsize
   usd_primvarindices
   usd_primvarinterpolation
   usd_primvarlen
   usd_primvarnames
   usd_primvarsize
   usd_primvartimesamples
   usd_primvartypename
   usd_purpose
   usd_relationshipforwardedtargets
   usd_relationshipnames
   usd_relationshiptargets
   usd_relbbox
   usd_removerelationshiptarget
   usd_setactive
   usd_setattrib
   usd_setattribelement
   usd_setcollectionexcludes
   usd_setcollectionexpansionrule
   usd_setcollectionincludes
   usd_setdrawmode
   usd_setkind
   usd_setmetadata
   usd_setmetadataelement
   usd_setprimvar
   usd_setprimvarelement
   usd_setprimvarelementsize
   usd_setprimvarindices
   usd_setprimvarinterpolation
   usd_setpurpose
   usd_setrelationshiptargets
   usd_settransformorder
   usd_settransformreset
   usd_setvariantselection
   usd_setvisible
   usd_transformname
   usd_transformorder
   usd_transformsuffix
   usd_transformtype
   usd_typename
   usd_uniquetransformname
   usd_variants
   usd_variantselection
   usd_variantsets
   usd_worldtransform

   Tip: to read about new functions quickly, copy the list in empty
   Sublime Text document, set VEX syntax and check documentation helpcards.