If you are looking for a free version of SketchUp, consider these official alternatives:
. These were provided via email upon purchase from SketchUp or an authorised reseller. Subscription (Trimble ID) : Most modern users access SketchUp by signing in with a Trimble ID If you are looking for a free version
There is no official "free list" of serial numbers and authorization codes for SketchUp Pro 2019. These codes are part of the Classic License These codes are part of the Classic License
SketchUp 2019 was a transitional version that supported two different licensing methods: Classic License Serial Number (typically starting with "UA-") and an Authorization Code This method does not require a serial number
system, which were unique, paid perpetual licenses. Attempting to use public lists found online often leads to errors or security risks from unofficial sources. Authorisation Systems in SketchUp 2019
(email and password). This method does not require a serial number or authorisation code. SketchUp Community Legitimate Ways to Access SketchUp for Free