float is not a db-compatible datatype
The table tx_dam defines two fields as floats. In the function t3lib_sqlparser::parseFieldDef(), which is called IMHO with activated dbal and if multiplyDBFieldSize is greater 1, float is not implemented.
Install dbal and then try to install dam, OR
set multiplyDBFieldSize greater then 1 and then try to install dam.
Please see closed bugs 2792 and 2793.
(issue imported from #M2991)