Version 95 created:

two tables
product_auction_extra
products_auctions

inserted...
product_types one key
product_type_layout 17 keys
configuration_group one key 'Auction Manager'
configuration 6 keys

Most of which are used in version 98 and 99. If you don't remove them all, you'll get errors when running the install sql statements. When the sql errors, it stops reading the statements. you can re-paste the file and delete the one that error up to the beginning, then run it again. Keep running the statements after the error until it completes.

The error is due to the keys already existing, not due to miss formed sql statements or php5.

Once it's installed your find 'Auction Manager' under configuration, and convert type under tools with a new product type call product auction.