The older methods (APC, Wincache, and XCache) have been depreciated for awhile now. They were removed with 4.6.2.
See the release notes at:https://invisioncommunity.com/release-notes/ (click on 4.6.2)
Redis is the only supported method for caching going forward. Your host needs to have the phpredis module installed on the server to connect to Redis. If it's installed, you'll see a configuration option to enter the Redis connection info.